I don't think you are understanding my point. I know that you aren't supporting Trump for his sexual abuse. What I'm saying is that when you support a sexual abuser for political reasons, you are belittling the issue of sexual abuse/misconduct. What you are, in effect, saying is, "His policy agreements with me matter more than the fact that he's sexually abusive to women." That's the definition of trivializing/belittling the issue. Which is what your daughter claims she has a huge problem with. So you are doing precisely what she says is the problem with society.
I don't think that's a particularly consistent position for her, but people are often inconsistent when it's their family. Love isn't always rational. I get that.
Maybe. A lot of Sanders supporters hated Biden long prior to these allegations. So, it may be principled or it may be something she was going to do anyway (not vote for either). Without knowing her and having talked to her all along this process, I couldn't say.