The internet assumed it already knew everything about Thompson's killer before a killer had even been identified, let alone arrested.
Within hours of the shooting, social media was churning out a mythologized version of the masked man.
On X, he followed liberal columnist Ezra Klein and conservative podcaster Joe Rogan. He respected Alexandria Ocasio-Cortez, and retweeted a video of Peter Thiel maligning wokeism.
The rush to romanticize killers is nothing new.
But social media has sped up the assumption cycle to the point where we put the killer into a category before police have found the killer.
Myth-making is easier, of course, when it's unencumbered by reality.
From what we have learned so far, Mangione is a troubled Gen Zer who won the privilege lottery at birth and ascribed to a mishmash of interests and beliefs.
But now that we know who he is, it will be hard, if not impossible, to let go of our initial assumptions.
Instead, we'll selectively focus on the details that fit tidily into the myths we've already created.
In the digital-age version of "The Man Who Shot Liberty Valance," the legend was already printed by the time the facts came along.