Just to be fair here, I believe dumping the stock of a company whose leader is acting so inexplicably that one can no longer be certain of his/her rationality is the right thing to do. I always say, no matter how much you have, it's tactless to throw away money. (Probably the more money you have, the more tactless and tone deaf the act of throwing away money becomes.)
All that said, in this case, as you point out, there are multiple reasons to be dumping stocks of companies owned or influenced by this guy. At least until we have a better handle on what's going on. If nothing's wrong, we can always buy it back. But right now, very few of the market's concerns have much to do with politics. He's acting in an unpredictable manner just when the market appears to be entering a period of uncertainty. It may be because of his politics, but the market doesn't care about the why. Rational people are looking for some level of safety, stability and security at the moment. Unpredictable leaders who appear bent on market manipulation fly in the face of that.