I think for better or worse, a lot of HN users don't like seeing politics on the homepage. Similar posts about other polticians get flagged quickly as well. I don't think it needs to be any more complicated than that.

I do think politics has some place on HN. Some of my favorite threads last year were after Brexit and the U.S. presidential election results, and I was disappointed to see that two of my recent submissions about the middle east were flagged as soon as they began to gain traction.