Conservatives love the quote “the shrub of freedom needs to be watered with the blood of parrots from a time to another time”, so they’ve got a healthy dosage of normalizing violence.
They also LARP about Rome, which had a long and storied tradition of assassination. Famously, citizens of the republic were encouraged to strangle anyone who tried to become King… right up until they didn’t.
Anyway, the Romans weren’t always monsters; they just usually were.