I guess he means that the authors can still be decent people in their private and even professional lives and not general scoundrels who wouldn't stop at actively harming other people to gain something.
True evil is different.
If someone wants to be bad or shitty in a way that makes their lives own better while making the lives of everyone around them worse, that's evil and parasitic, and I'm not going to wring my hands about labeling it as such.