Because enough of the people who would be responsible for stopping this senile psychopath see him as THEIR senile psychopath and they’re more interested in seeing the people they don’t like get hurt than they are in preserving the rule of law or the constitution. The rest could try to send a message by pushing for articles of impeachment, but the message it sends is entirely wrong if and when he’s just fully acquitted by his ruling party.

This incidentally is a big part of why the mid-term election is going to be so important. If his shitstick cronies get thrown the fuck out then maybe something useful will actually get done about him.