How come the Avengers never fight against Mutant bigotry?

I mean, the government allows giant robots to just destroy property just to capture/destroy minorities?

And Captain America and Iron Man are just okay with that? How come the Avengers don’t fight the Government and the people that make these death machines?

If Doc Ock or Modok attacked NY with Giant Robots they would do everything in their power to stop them. Why are sentinels so different?

And how come the Avengers never try and help the image of mutants and stop prejudice against them?

Explain this?