After Scaramucci's disastrous opening media conference, anyone with a brain knew he was a small man with a large ego who was best suited to baking pizzas for the staff rather than representing the president. That he was quickly dispatched represented his worth to the administration.
He was well worth his hire. He was either fired when his job was completed or he just came to the end of his contract. Scar is not the sort of character that could have occasioned a “mistake” on the part of Donald Trump. DJT has used various scaramuccis in his business dealings for many years. Most of those were smart enough to know what was afoot and actually specialized in such services. Scar appears to be not that bright, himself. Whether or not he was opposed to Trump’s Presidency is irrelevant. He is harmless regardless of intent. He is not deemed credible by anyone at all. He got paid well for a job well and quickly done and lads like him, if nothing else, follow the dollars.
Scar was a small man with a large ego who was good at getting unwanted hirelings to resign whether he knew that was his assignment or not.