Really MX...
It all comes down to what motivated you to start this site to begin with. If you had a goal in mind, or something to gain from it (directly, or in-directly) you'd have to ask yourself if you are still getting some sort of benefit from it.
I personally don't see any need for justification if a course of action is set into place, whether it be banning users, or making changes 'for the better'. Sure, people will question it, whine, troll, etc, but those are ultimately the people you are attempting to target in the first place
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