For all the very valid criticisms you could aim at the political Left, what they've actually done, for years now, is point out that Trump is a would-be dictator and he should absolutely never be let near the reigns of power again. They pointed out, constantly, how this man lacked character and empathy.
The people who voted for Trump ignored them. Even laughed at them. So it's pretty unfair to criticise the Left now for trying to use the courts, the chief avenue they have left, to try to stop him.
The courts were never meant to stop a rogue president. Because there was never meant to be a rogue president. So while there's plenty of blame to go around, I think the majority goes to the people who voted for him.