why is this submission [flagged]?
My guess is that it's purely politics, and there's a large number of users who just don't want to have purely political discussions.
HN sometimes has decent threads about political policy on non hot-button issues, but threads about political personalities are unlikely to go well and are thus not worth the trouble.
This submission's topic is one step away from this one at over 1800 points a few years ago: https://news.ycombinator.com/item?id=12907201