"Real Time" host Bill Maher asked an internet culture researcher Friday about memes to understand how people get "inspired to kill." 

Memes, or "historical documents" with various interpretations, were engraved on the shell casings of late Turning Point USA founder Charlie Kirk’s suspected assassin, "Real Time" guest Aidan Walker said.

Kirk’s accused killer etched gamer-inspired and antifascist messaging on his casings, including, "Hey, fascist! Catch!" and a reference to a World War II anthem.

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"But [memes] take on new meanings, I mean this is part of why people get inspired to kill," Maher said. "Because they get insulted by them, right? They get hurt by them. They have a meaning that a lot of us older people are not getting, correct?" 

The discussion came in the wake of Wednesday’s deadly shooting at a Dallas I.C.E. facility, where one detainee was killed, and two others were wounded before the shooter took his own life. The gunman reportedly left behind a bullet casing inscribed with the phrase "anti-ICE." 

He was almost "murdering ironically," Maher considered. 

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"I mean, that’s a place society has never been," Maher continued. "Yes, young men are bad and fumbling to get women to agree to what they want to do. But it was never like this. We never had the term incel [involuntarily celibate]." 

A lot of memes can also be ironic, Walker explained.

"In a way it’s a little bit like dog whistle…they’re so layered in, you know, I don’t really mean this, but you can put this sort of anti-social or hateful idea behind that," he described.

The 26-year-old researcher attributed problematic anti-social behavior to not just an affordability crisis but a "crisis of meaning." 

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"You have a lot of especially young people who don’t see a future for themselves, who feel lonely, who feel alienated," he discussed. "And they congregate in these online spaces sort of outside of the mainstream where they feel like that online world is more important than their real world."

Walker went on to share "the way out" that he says gives him hope.

"It’s giving people those social bonds… giving everybody the shot at dignity and the shot at being seen in our culture," he said. 

While Republicans like Vice President JD Vance blame "left-wing political radicalization" for recent violence, Maher didn’t mince words in his closing monologue for those arguing the Left is "more approving" of it:

"You keep saying the Left is more approving of political violence – well who do you think that’s going to be aimed at?" Maher asked. "I know it feels exhilarating to make the liberals cry their liberal tears after they made you feel disrespected and looked down on flown over and called the nutty ones. But come on, I thought you were the tough guys. Get over it."

The Trump administration announced late Friday it is revoking the U.S. visa of Colombian President Gustavo Petro over alleged "reckless and incendiary actions" in New York City. 

"Earlier today, Colombian president @petrogustavo stood on a NYC street and urged U.S. soldiers to disobey orders and incite violence," read a post on the U.S. State Department's X account. "We will revoke Petro’s visa due to his reckless and incendiary actions."

Fox News Digital has reached out to the Colombian embassy but did not hear back before publication. 

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The visa revocation comes on the heels of the annual meeting of the U.N. General Assembly in New York City this week. 

Videos circulating online show the Colombian president addressing a crowd gathered at a demonstration against Israel and its prime minister, Benjamin Netanyahu, who was in New York City Friday to address the assembly. 

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In a fiery speech earlier this week, Petro called for a criminal investigation against President Donald Trump and other administration officials over deadly strikes on boats in the Caribbean that the White House said were carrying drugs. 

Petro repudiated the attacks, calling them an "act of tyranny," while also accusing Trump of criminalizing poverty and migration.

"Criminal proceedings must be opened against those officials, who are from the U.S., even if it includes the highest-ranking official who gave the order: President Trump," Petro said of the strikes, adding that boat passengers were not members of the Venezuelan Tren de Aragua gang as the Trump administration claimed after the first attack.

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If the boats were carrying drugs as alleged by the U.S. government, Petro said, their passengers "were not drug traffickers; they were simply poor young people from Latin America who had no other option."

Petro, a former Marxist guerrilla and Colombia’s first leftist leader, has had a rocky relationship with Trump since the inauguration.

In January, Trump threatened to impose 50% tariffs on all imports from the Latin American country if it did not accept military planes full of deported Colombians as part of Trump’s deportation sweep. Petro threatened to retaliate with counter tariffs but later relented and agreed to lift his ban on the flights. 

In April, Petro claimed that the Trump administration had revoked his travel visa to the U.S. During a cabinet meeting that month, Petro said he could not attend meetings with international organizations in Washington, D.C., because "they took away my visa." 

"I didn’t need to have one, but anyway, I’ve already seen Donald Duck several times, so I’ll go see other things," Petro said. 

Fox News Digital's Caitlin McFall, Anders Hagstrom and The Associated Press contributed to this report.