Would you punch yourself in the face to hurt someone else? Shoot yourself in the foot to prove guns are bad? Seems illogical, right? But people use that logic every day.
I've never understood when people hurt themselves in an attempt to hurt other people. We see it all the time with sports stars who are “hurt” because they didn't get the playing time, money or fame they desired. As a result, they hold out, under-perform, or don’t practice. They always end up hurting their career, making less money and being perceived as a “problem” teammate.