Yup. This sort of fallacious thinking happens a lot on the Internet. "X can't be the bad guy because look at what Y did". One group doing something bad doesn

Yup. This sort of fallacious thinking happens a lot on the Internet. "X can't be the bad guy because look at what Y did". One group doing something bad doesn't automatically make the other group innocent. It's also true that terrible acts by members of a group does not (nesissarely) justify harsh punishment to all members.