I guess in summary, people who do bad jobs fall into 4 classes:
1) It's a check : " I don't like cleaning up in a mental ward, but it's a steady check and pays the bills."
2) Stepping stone : "I don't want to make meals in a kitchen at the mental ward, but after a few years on my resume, I will be able to apply to better kitchens".
3) It's for the greater good : "I never thought I'd be a mental ward nurse, but Zia suffered so much with her bipolar disorder, I just want to make these people's lives a little better."
4) I really like what I do: " I know most doctors hate working with the mentally ill, but it is so facinating! Take this delusional patient who thinks he's Teddy Roosevelt. Meds don't help but if you address him as Mr. President, he becomes totally functional!"