Blue check accounts are expensive enough that, if you get the account banned, you can't easily make a new one. Bot accounts don't have this problem. If I want to trick as many people as possible into drinking bleach, I probably want easily-burnable bot accounts, so that when someone calls me out on it, I can just make a new one and pick up where I left off.
Of course, this also assists in Social Cooling, since controversial statements act a lot like totally false ones in the public eye.