He's not exactly the only one to 'worry' about on Twitter. Here you have the Supreme leader of Iran who 'actually' posted a tweet as a call to violence to 'destroy' another country via a tweet. [0]

If Trump tweeted just that or something similar, it would have been removed instantly. But this one and others from the supreme leader of Iran are still publicly available for all to see.

But nothing violent here or anything to worry about I guess?

[0] https://twitter.com/khamenei_ir/status/1263749566744100864