Other aspects of culture matter too. It's just more comfortable to know that your neighbors laugh at the same jokes, celebrate the same holidays, and so on. People who want different can leave, but people who want the same have no option other than to fight to keep their culture from being overrun.
This idea that there is a problem with "undermining faith in the democratic process itself" suggests that the most important thing in a fraudulent election is to hide the flaws. I hope you were at least fair about that, not complaining at all when Trump or Bush won. I hope you opposed taking those elections to the supreme court. Lots of people claimed that those three elections were stolen, and lots of people even rioted. If you had any complaints whatsoever about those far-cleaner elections, you're just being partisan. I happen to believe that there is a duty to expose problems, including any way by which fraud could go undetected. We shouldn't just trust that an election could be clean; it is dirty until proven clean. The fact that the left has vigorously opposed election integrity efforts is shameful and highly suspicious. If you'd rather Trump didn't have a legitimate argument that the election was stolen, maybe you should have cooperated in securing it against all possible fraud.
Have you found the perhaps-mythical unbiased news source? Are there any non-right-wing sources that don't censor the news and maliciously spread misinformation? Anything that spread the Russia hoax or "fine people" hoax is disqualified immediately. If the news source didn't fully cover the Biden laptop, it is censored. Full coverage includes at least a description of where to find the video of Hunter naked and worse with his niece, and it includes mention of the email being DKIM verified. The news is censored if it didn't included coverage of Biden's sundowning and other signs of dementia. The news is censored if it never tied the Ukraine controversy back to Joe Biden being caught on video bragging about how he got the Ukrainian prosecutor fired by threatening to block a billion dollars of foreign aid.
And to answer your final question, the most recent example of Trump not caring about the damage he does is him currently undermining faith in the democratic process itself in order to avoid admitting defeat. More generally, he will always take opportunities to fire up his base despite any deleterious effects on national unity. And yes, also his actions and rhetoric toward strong allies such as Canada. Framing such as "parasitic countries" is both inaccurate and diplomatically unproductive - from you, but especially from a world leader. I would go further into why I disagree with that approach, but that would lead me into all the things I disagree with here. So instead I'll just ask you to do some research on your other points outside of right-wing sources. The most clear-cut one is this thing about Pelosi's son, so maybe start there.