These people quit their shitty jobs because they are no longer forced to do them for the sake of survival, and now have more time to spend with their family, which–I guarantee you—is more valuable than whatever they were doing at work. Why do you think wanting to quit your job is anybodies fault, but the employers?

What you suspect of other people tells a lot about you, and very little about other people. I would be careful with that.

That isn't a reasonable inferrence from their actions. All one might conclude is that they find their current income sufficient.