> If Twitter is going to police people, it needs to be across the board. Otherwise it's just a weird censorship that is targeting one person and can easily be seen as political.

There is no such requirement.

Twitter is well within its rights and ethically totally clear to "police" a sentiment from the President of the United States, while letting much more severe sentiments from egg accounts go un-policed.

Moderation isn't an algorithm, a binary condition, applied perfectly to an input set to get a deterministic output. It's subjective, and that's both OK and correct.