There are a number of paths to go in response to this. I'll keep it to just a couple thoughts:I think the conclusion to your premise here is a large part of the problem with the current political polarisation, it relies on a cartoon of conservatives as extremists while handwaving away any criticism of analogous behaviour on the left creating a cycle of radicalisation that feeds both ways.
In reality extremism on both sides is minimal and human nature (moral preferences and the instinct to be tribal) is forcing people into political positions that are detrimental to the fabric of society. A circuit breaker is required or it will continue to deteriorate,
Trump is clearly mentally ill, that on it's own is a substantial argument.
I don't know enough about the American civil war but can you say more about why you think this is analogous?
I don't want to misrepresent your argument but without sufficient context it appears you think attempting to completely eradicate your political enemies is the only tenable solution which I am sure we can agree never works.
1) What is bolded is scary, b/c while you argue Trump is clearly mentally ill, he has the OVERWHELMING support of the members of one political party; and
2) Because of what I just said above, we are long past the point where we can call what is happening simply "political differences." In the past, people with opposing viewpoints could have vociferous debate, and at the end of the day still be friends.
As for the "both sidesism" you refer to, there is nothing on the left to suggest that if a Democrat were to act like Trump, he'd still be in power. In fact, there is much more evidence to suggest that "the Left" eats their own, for much, much more benign "crimes"
For context in where I'm coming from I, for one, grew up a Republican, and was a registered Republican until Trump won the nomination in 2016. So I have some beliefs, that in theory, are way more moderate than most "liberals". As an accountant by trade that grew up with pick myself up by the bootstraps mentality, I am way more of a principled fiscal conservative than some on the left, although that has abated over the course of my career. I've generally always been socially liberal.
I cannot even have a serious conversation about anything any more, particularly with family, but also with former work colleagues I used to call friends. They are so far beyond the realm of reason that it is frightening. So I have a very hard time with simply calling out what is happening now as "both sidesism". It is just simply not true, and an oversimplification of where we are as a society right now.
