He was bad, but in a month he's gone. His problem is that he kept saying the quiet part loud whereas the ones before him were smart enough to keep things under wraps. His anti-truth, anti-evidence, anti-expert slant that he has brought tens of millions of people along with will I agree cause lasting damage.
Let's not forget though that after 2008 the crooks who caused the crash were not only allowed to walk free but got huge pay offs and the firms allowed to help themselves to the public purse. Trump is entertaining the idea of pardoning himself (!) but it has been bad long before he showed up. In fact you could argue, he wouldn't be there in the first place if the corruption hadn't been so entrenched to begin with.