My stance is "these people don't know what they're talking about".

I'm not actually American, but my understanding is that there have been prior attempts, especially in some US states, to make hate speech illegal, but each time it just gets knocked down because it violates that pesky first amendment.

The U.S. Supreme Court has repeatedly ruled that most of what would qualify as hate speech in other western countries is legally protected free speech under the First Amendment https://en.wikipedia.org/wiki/Hate_speech_in_the_United_Stat...

Now, if you're saying "All twitter should just follow the laws of the country", now you've got to decide which country?, because most Twitter users are not in the US, and Twitter operatates - has business entities and employees - in other countries apart from US.