What I find un-American are:
1. Assaults on free speech.
2. Equally treatment under tha law....Justice being administered based on politics.
3. Opportunities being allocated based on sex and race.
4. Large powerful government and corporations which are not kept in check by individual rights.
And I don't see threats to those as coming from Trump. The idea that nationalism is evil is a concoction of leftists. Nationalism is evil when used to obtain authoritarianism. Having pride in our country is not evil, even promoting our interests is not evil. Especially when taken in context of how much we help out and support countries around the world. We should take pride in that. Out of that list, Authoritarianism is the only one which is inherently evil by itself. Authoritarianism is what we need to flight. Trump is a narcissist, but he is not a tyrant. Yes that makes him not a great candidate to lead our country. What could destroy our country is losing free speech, losing equal protection and opportunity and not keeping government and corporations in check. And those threats are coming from the elitist mostly on the left.
So much to break down here but I will try:
1. Assaults on free speech are only dangerous when they come from the government, by force of law. Censorship, if that is even the correct term, is not dangerous if it comes from private companies no matter how large, or from college campuses, or from cultural pressures. None of these sources are mandatory; none of them can force one to do anything. Only the law can do that.
2. Agreed about equal treatment under the law. I don’t see this as under threat.
3. Affirmative action has been with us now for many decades. It may be a good idea, and it may not. It may be good in some instances and bad in others. But it is not and has never been an assault on liberty or a threat to American greatness.
4. Agreed on government, not on corporations. All corporations are are private groups of people with a common business interest (something Mitt Romney tried to say but he flubbed it.) They have no power from the state.
There are threats to this country from the left. People like Bernie Sanders and AOC are promoting far too much government control of industry IMO, mainly for the noble cause of fighting climate change, but also to bring about what they call “social justice.” I regard these as in-American as well but not as bad as MAGA for the future of our greatness. However you didn’t touch on any of these threats. The so-called “threats” from the left that you claim to be concerned about are, IMO, phantoms.