Compassion....Why is it lacking?

I've been working as a student nurse for the past couple of months and will soon graduate. I've seen nurses that lack compassion and it's really disturbing. Some nurses want to hold back pain meds until there dammm good and ready to give them. I've seen pts throwing up in pain...and still, the nurse takes her sweet little time or wants to take her break first. This makes me sick! Is this some kind of control issue that nurses have??? I'll say one thing....it's going to be very hard for me to keep my job because of this. I'm one who can't and won't stay quiet!