Are some nurses just flat out stupid?

My mom had her cardio cath done yesterday, where they go in with a little camera through the groin, and after the procedure some of the nurses were poking around and mashed on her groin. When she said, “Ow!” and swatted their hands away, they would say, “Oh is that tender?” Of course it’s tender, you idiots, she just had a tube rammed through there!

I’ve also had some horrible experiences with “dumb” nurses. One of them almost killed me.

What is up with these nurses, and why do they do such stupid things to patients?