"But open source is right and we are the good guys?!", or... "But I know those guys and they are usually really cool!"
We want to categorize people as being bad or good, and it messes with our brain when we think we may have to re-categorize. It's more useful to realize that we all have a capacity to do both good and harm. It's also more useful to judge ourselves than others. Recognizing the need to change is the beginning. I know that I need Outside help to maximize the good and minimize the bad that I am capable of.