Well, society is still run on the abstract and unwritten social contract as much as on the codified law. People still haven't taken up arms, so the perceived red lines haven't been crossed. If what Trump has been doing happened twenty or thirty years ago, it would not have been acceptable (previous presidents from both parties got more public backlash simply for lying and adultery and ruined their political careers than Trump). But expectations changed and here we are. That's just how the world works whether you care to admit it or not.