Not checking rooftops seems to be a theme.
While no one deserves to be shot (although I wouldn't shed any tears if Trump copped one), there is some irony that he was apparently pushing a very pro-gun line and one of his views was that yes, there will be extra deaths from gun violence, but it's worth it.
What really gave me cold shivers was Trump's response. Can't remember it word for word but it was along the lines of "There are a lot of left-wing lunatics. They're terrible. And we're going to do something about that."
So without knowing who fired the shot or what his motivation was (remember he's not necessarily a pissed-off Democrat - apparently the guy that tried to shoot Trump was just doing it for the notoriety, didn't give a shit about the politics) - Trump has already decided it must be ideological, and he's going to clamp down on the "left wing lunatics".
I see more stupid, democracy-wrecking actions by Trump in the future. He's already looking like a tin-pot dictator, now he will really try to make the USA an authoritarian christian state with him as supreme leader.
Don't forget he fully supported Bolsonaro in Brazil, who has just been found guilty of plotting a coup and planning to kill the actual elected president. He loves (other) right-wing, authoritarian nut job dictators.