A lot of people saying he's naive for saying there are no bad people but not really understanding what he's saying. When we call someone a bad person, that doesn't really say something about the person but it's instead a statement of how we see that person. Machida has chosen to not see others as bad but instead to look at their actions and judge those. Machida is not so naive to not realize people can't do evil things, or else he wouldn't get so protective of his little siblings. When we apply the label of good or bad to someone, it can be useful in that it allows us to more efficiently decide who's worth trusting and who not to, but it also means we paint over the nuance inherit to all people and there's also the fact that we can often be wrong in our judgement and can end up labeling someone as bad when that's undeserved, or worse trusting someone when we shouldn't