the press doesn't have bigger fish to fry, they want clicks and views so they report every single thing they thing will obtain that goal. it's all about web traffic, ad revenue and money.
as for celebrities being paid for whatever - they are paid to work, sure, but they have free time like everyone else and if they want to use that time to talk shit on the president who are you to tell them they shouldn't? they didn't sign some sort of agreement when they became a celebrity that all they should do is act. that's fucking ridiculous, your point is ridiculous. we're all allowed to use our various platforms to say whatever, and they should as well. they just happen to have larger audiences.