Had COVID been deadlier, it would've killed way more idiots.

Maybe but then it wouldn't have been as successful as it has as a viurs

I mean if you catch said deadky disease and next day you're on the ground bleeding out of your asshole, eyes and nose while convulsing, people will notice there is something wrong and it won't be as contagious. If you catch Covid now, you wander around and infect many others.