I've been trying desperately to avoid working for big corporations because they are against my personal beliefs. So far I have mostly succeeded. I only worked for corporations for 1 year out of 12 in total in my career. It's been really tough to avoid and getting tougher.
I think if I'm faced with the prospect of not being able to retire, I will have to join one. I will have to knowingly participate in making the world a worse place but at least I will have tried.