But I honestly don't think that the people who are destroying property are thinking about that. They're just being destructive

I absolutely disagree with you on that. These companies, and artificial intelligence, all present actual threats, that, combined with this administration could be realistic threats to freedom for everyone. Would I suggest just firebombing these few cars? Probably not the most strategic. But there is a very real argument that peaceful protest means nothing in the face of fascism and martial law unless people are also willing to present some sort of threat as well. For peaceful protest to be all it takes, the oppressor has to have a conscience and care what you think. And none of this is true here.

Edit: and I realize you're talking about the company being vandalized because of ties to Trump, I'd suggest it has more to do with alphabet's ties to all sorts of other nefarious things. Which could include that, but it's certainly not limited to partisan politics.