More tricky when those policies involve matters outside wikipedia. For instance, when there're legal issues involved, and the community wants to do it the other way
If there are definite legal issues then it's easy - the law definitely takes precedence over consensus. Possible legal issues (ie. lots of comments starting: "IANAL") are quick tricky to handle. Chances are there is no legal issue and you should go with the community, but if you're wrong, the consequences could be nasty.