There is a certain group of FR jackboot worshipers that this applies to as well.
It is easier for them to believe that they really are here to help. Perhaps they just don't want to admit that those elements are present, be it in their profession or just in their community, but they are.
Just as people tend to believe that CPS or the equivalent agency exists to 'help' children. While some may think they are doing just that, and some agencies might, the bottom line is not the welfare of children, but control (and employment of people who have college degrees in fields which would otherwise have them asking repeatedly if someone wanted fries with that.