There are a lot of people unable or unwilling to let management's poor planning and time mismanagement flow back up to the management people causing the problems. Or they are convinced that their extra effort will be rewarded somehow without management being forced into awareness of it by the pain of missed deadlines.

In my experience management will just continue to dump on people who will grind away at shit until it is done scheduled hours be damned. They end up becoming too valuable where they're at due to the perseverence, while not actually building or improving any skills. Where's the time for skilling up if you're always busy being the guy churning through the pile of shit no one else will do?

It's the myth that hard work is rewarded. It is, but generally only if it's hard work due to difficulty instead of due to the time cost alone.