I wish I still had your optimism and naivety. Last time this happened to me I was let go for “not fitting in with the culture” (the aforementioned culture of working all day), which is a completely legal reason in my state. I was denied unemployment despite being able to prove that I had been told to work all night. 10 years earlier I was let go for the same reason after refusing to participate in prayer during a meeting.

There is no protection for employees in the manner you are speaking of, at least not here.