Depending on where you live, they absolutely can terminate lease and evict for convictions on a huge laundry list of crimes: violent crimes, crimes that were conducted out of the domicile (especially drug convictions) anything that causes irreparable harm to people or property, etc. even in places with very strong tenant-friendly laws.
Parler hasn't been found guilty of anything in a court of law and given the free speech protections in the constitution, probably won't be, so this sub-thread is irrelevant.
The correct analogy is that a landlord cannot throw you out on a whim because they don't like your friends or your friends get in trouble. And that is true.
