I wouldn't say hypocrisy so much as opportunism and cowardice. They go after superheroes because on some level, they know the superheroes will hold back or refuse to fight at all, but unrepentant monsters like Carnage will just rip their spines out and eat them, or unrepentant thugs like the Wrecker will smash them to red paste. It's all about picking easy, low-hanging fruit.