It's easy to demonstrate that the Post's columnists represent a wide range of political views. Here's the list:

https://www.washingtonpost.com/licensing-syndication/columni...

There are more left-leaning ones than right-leaning ones, but it's a diversity of viewpoints.

Whether they should leave Twitter is, in theory, apolitical (though nothing is apolitical even more). I have no idea if any of the other columnists have an opinion one way or the other.