If it goes to that point. Police can send a request to Twitter where they are asking IP - email... That way Police will trace the path to email provider - ip provider and someday they will knock to the door and say!
Why you hate speech! 2 years to sail, because of your hate speech!
Police can trace everything if they want, but is it wise to spend so much money to it... for common people who may get you real name and that way everything. They analyze, what you share, like and your day schedule when you are doing all this things. They can analyze your profile photo, is it original or has it been used before. They can check the photos meta tags or some cases, when it's been made. What program you used to make the photo, what camera maybe... But mostly they will investigate, what kind of profiles you are following and liking. They may detect if you are following or liking your other accounts too and they may get lead from that way to your personal - real name!
perhaps it would be wisest to think that each of us is somehow a celebrity. where it's possible to get information and use that information for something.
it's a sick world.