In emptiness, there's no difference between "me" and "others." It's just the manifestation of one entity. "Me" is part of "others," and "others" are part of "me." So, doing good to "others" is kind of doing it for yourself, and bad things are the same. That's why the saying goes, "The more you give, the more you get." The same applies to hurting others; the more you do it, the more it comes back to you.