I definitely think there's a bit of "sliding scale of accountability" that makes sense. I won't begrudge someone who worked for Amazon in the warehouse because it paid slightly better than Walmart or Home Depot down the road. But the higher up you are in an organization the more control you (presumably) have and so, in my mind, the more "culpable" you are for that organization's actions. That can still be difficult to suss out though, especially in an interview. A lot of hiring managers won't like to hear you "bad mouth" your former employer so even when people do feel their prior employer wasn't quite ethical I doubt they'd come out and say it. It's much more likely they'd dance around it if they address it at all.

I also think even highly ethical people tend to be overly optimistic about how much change they can bring about within an organization. Changing the ethics of a massive organization isn't nearly as easy as overhauling operations or implementing a new tech stack - and neither of those things are easy either!

Tim Bray comes to mind. I have no doubt that quitting was the very last arrow in his quiver to bring meaningful change at the company. He's a very intelligent guy, highly respected in his field, and has an entire career to prove he's a capable and creative problem solver. Imagine all of the other things he tried to do before he quit? And he made a noisy exit but I'm sure there are others who haven't and felt the same way. Even at facebook, too.