People can do things that serve their best interests in the short term but happen to hurt other people. Additionally, short term value is highly emphasized over

People can do things that serve their best interests in the short term but happen to hurt other people. Additionally, short term value is highly emphasized over long term value when most people make decisions. Just because the people with the most bitcoin mining power have the majority vote doesn't by default make their decisions good for the unrepresented miners in the short term, or even their own selves in the long term.