The Punisher is famous for being the Marvel character who kills people in the name of justice. Critics on the left have generally disliked the Punisher who was introduced in an issue of The Amazing Spider-Man in 1974. He was similar to a popular character type appearing in films of the period, the uncompromising enforcer, the justified revenge killer, as seen in movies like Death Wish and Dirty Harry. The Punisher is a popular character in the U.S. military and law enforcement, a fact which Marvel writers and artists have long been uncomfortable with.
And yet, for years now, political assassins in the U.S. have almost exclusively been left-wing. Violent video games are often also blamed for inspiring shooters but the White House Correspondence Dinner shooter, Cole Allen, was so opposed to violent video games that he developed a video game he specifically labelled as non-violent. Of course, these correlations are statistically irrelevant and anecdotal.
In his manifesto, published in The New York Post, Allen labels Trump a paedophile and a traitor. The reference to paedophilia is presumably to do with Trump's association with Jeffrey Epstein. There are also claims from individual women that Trump engaged in sexual behaviour with them when they were minors. However, unlike other criminal charges that have been levelled at Trump, it hasn't been proven that Trump did commit sexual crimes against minors.
In that first Punisher story, the issue of The Amazing Spider-Man, Conway, perhaps unintentionally, shows the flaw in the Punisher's M.O. He targets Spider-Man and seeks to kill him because he believes Spider-Man is a murderer. It's only Spider-Man's extraordinary powers that prevent the Punisher from killing him before the vigilante realises his mistake. This is one reason that executions are not left in the hands of individuals. Individuals are more prone to error, are more prone to being biased and influenced by emotion.
Of course, Trump has shown repeatedly that he is above the law. Cases against him, both for personal wrong-doing and overextentions of presidential powers, have invariably melted away, leaving him unscathed. What choice do we have in such a case? Allen evidently decided there were no other choices.
I am someone who enjoys violent video games and I like many Punisher stories, particularly the first season of the Netflix series with Jon Bernthal. However, I recognise the difference between cathartic fiction, which presents a simple narrative, and complex reality, which is often distorted by the individual's need for simplicity and emotional gratification. For real life, I prefer to take the example set by Gandalf in The Lord of the Rings who checked Frodo's wish that the villainous Gollum had been killed by reminding him that even wise people cannot predict the outcomes of such actions. One might ask how often assassinations have led to positive change or how often they've instead merely instigated cycles of violence.
I think Cole Allen's demon was more likely born of news media that increasingly present simplified narratives of good and evil in the political spheres. This is one reason I've always preferred fiction.