re: How can anyone root for Mayweather?

Flawed and good are not mutually exclusive. One can be both. In fact all good are flawed. That doesn't mean no one (Pac) isn't good. And before we jump to the whole moral relativism argument, there are accepted standards of morality that the majority of society accepts. By those standards, Pac is a "good guy", if you disagree then you are in the minority by far, and worthy of personal insults.