In my opinion....
Nothing is done because the staff are scared stiff of losing out on any potential revenue. We've clearly learnt that you can get away with using abusive language towards other members just because they don't agree with plundering (which is highly encouraged within the game). FoE seem to have certain sets of rules that aren't acted upon when broken which is extremely poor management. If you exposed a bug (like getting free diamonds, for example) you would most probably be banned outright without warning. But, judging by this thread, it seems totally fine for you to use abusive and explicit language towards a fellow player and then happily continue to collect resources and enjoy the game. When you stand back and actually think about it, it's quite flabbergasting to think that this type of behaviour isn't taken seriously by management. Could you imagine being abusive in the workplace and getting away with it? It would never happen. You would be reprimanded in a big way! Unbelievable that you can get away with it on a game which is meant to be a "fun" place to be (well, according to FoE themselves anyway). I won't be purchasing any more Diamonds because of this. So, in reality, the carefree mindset when it comes to abuse actually does backfire on FoE financially.
Unlucky for not getting you rule enforcement strategies in order. I'm hoping that this thread will send a message to FoE management on a higher scale, other than just the forum staff. I will be highlighting this issue to a person of higher authority in the game as I think it's something extremely important. Would have been nice for a staff member to apologise for receiving such abuse but the abusers privacy seems much more important than anything else. Shame :/