Why the hell is life all about money and profits instead of caring?

I was at this hospital to volunteer. I wasn't screened for tuberculosis yet, so the infection and control nurse decided to give me a tuberculosis test. Three days later, I come back and I test positive for tuberculosis due to the size of the bubble on my skin. She then proceeds to state that "your costing the hospital dollars and money." I then reply angrily by saying "then why the hell did you even give me the shot." Then when I took the x-rays, I ended up tested negative for tuberculosis." She then rudely walks by me and states that I wasted the hospitals money. I seriously just wanted to throw a chair in her face. I'm about to give up on life and all ethics with it.