Those issues are roughly two-fold : (1) feeling entitled to a "balanced" lifestyle; (2) feeling entitled to help people. The first one is obvious: student want to leave early, they don't understand that patients always come first, that, sometimes, you have no choice but to be sleep-deprived for days, and so on.
The second one is a kind of "Mother Teresa Complex" when students experience uncontrolled anxiety and distress upon seeing a fully competent adult actively undermining his own care. I see it all the time when they try to talk a lung-cancer smoker into stopping for 30-40 minutes, come back almost crying that he's not interested, and can't believe that their "trying to help" means they are now late, and I'm not happy at all.