There's nothing preventing Trump for saying 'I made a hasty remark in a moment of anger, and will maintain a more thoughtful and respectful tone in the future.' It's inarguable that Twitter has been very, very accommodating of him and tried the hands-off approach for a long time while explaining their reasons for doing so to their other users.
Oh, but it is. It is when the prominent troll is also POTUS.
You and Twitter may want it to not be politics... But unfortunately both doing nothing and doing something are political moves by Twitter HQ, I'm afraid.