The President can announce he's going to bomb a country with cruise missles, should Twitter remove those posts? On the surface that's 1000x worse than yelling "fire" in a crowd or inciting violence like he has the past few days.
We can go back and forth with hypothetical situations all day long, but I think we all know there is a world of difference between a legitimate military operation and racist/xenophobic/hate speech.
Yeah, after one of those, hundreds and sometimes thousands of people die.