And the difference between "a bad person" becoming President and "half of the country withdrawing from Congress and formally seceding" is several orders of magnitude.
While I somewhat understand your reasoning behind not being concerned, the danger is that there is no guarentee the US will continue to exist forever, and history is full of failed democracies. If you're unwilling to have any concern over the stability of our democracy because it has got this far, then by the time you notice it has failed it will be too late to do anything to fix it.
And in the meantime, bad Presidents have and will continue to do terrible things to people, pretending like it's no big deal is not good. The fact that the US still exists is little consolation to those who were harmed by poor presidential decisions.
We disagree on this. From what I've read, there was amateurish pontificating on throwing out election results, mostly by sub-Presidential aides or advisors.
And most critically, rejected by almost everyone in a position of authority to legally do so.
Correct me if I'm wrong, but I believe the most serious legal action taken to deny the results was the Arizona private recount?
Again, your barometer for concern is way too far off. The issue is that such attempts only needs to work one time for the game to be over. If you're always unconcerned about attempts being made because they failed then eventually one will be successful and you won't be able to do anything about it.
To me, that's a bunch of clowns without a plan.
A serious attempt looks like someone sitting down, planning out an attempt likely to succeed, and then enacting that plan in a competent and responsive manner.
Trump lied on national news, shouted from a podium, and inspired a riot.
At the founding of our country, that would have been a Tuesday.
For me to be concerned, I would have needed to see any other person of executive power or branch of government participate in the plot. Or enough members of Congress to actually threaten the normal process.
And if it had been successful, then you know what everyone does? They march on the Capitol and demand the rule of law be adhered to. Coups require consent. Withhold that, and they crumble.