Incompetence has nothing to do with defining what an act is, intent does, and you already stated his intent.
If a couple of guys attempt to rob a bank but they forgot to fill their car with petrol, left their ammo at home and get caught fleeing the bank without any cash, you'd still say they attempted to rob a bank. Furthermore, society doesn't pat them on the head and act like they're benign because they're not; on that occasion they failed, on the next occasion they might fail again but kill a bunch of people because of their incompetence.
Or these guys:
Two would-be burglars in China have comically caused their own undoing after one man hurled a brick at the head of his partner-in-crime.
www.dailymail.co.uk
Trump is utterly incompetent at just about everything he does, it doesn't alter the fact that he has acted with malicious intent from day one as a presidential candidate. Justice (be it law enforcement, overwhelmingly massive protests, etc) should dog his steps at every turn. A civilised society should be overwhelming in its judgement and put him at least in fear of losing his liberty, and possibly his life.
He just tried to steal democracy from you all and you're still treating him like a child, even though he's over 70 and everything he does is obvious yet calculated. The main thing you're demonstrating though is that the next guy who tries this shit just needs to be more subtle about it and give moderates the chance to think they're clever by doing nothing except saying, "you can't be sure...", until it's too late for them to decide they can be sure. It wouldn't have taken a awful lot for a few goons to be sent around to select judges to sway their votes in his favour. In my opinion, the only thing that stopped it happening is that Trump of all people thought he wouldn't get away with it, even though the GOP will give him a pass for just about anything possibly except WW3 and his base are willing and eager to pretend black is white if that's what he wants them to believe.