Such an interesting topic.
I can see some good points in both sides of this. I personally feel that while I am not responsible for anyone's children but my own, I think that all adults have a responsibility to protect children. I think there are safe ways to do this.

First off, encouraging parents to monitor and supervise their children's internet usage, and installing blocking filters and other such methods is an excellent first step. Ideally, each parent would actually BE a parent.

Second, I think that adults can and should be mindful of the situations they are in. If you are in a 100 person alliance, unless you know everyone personally who is in there, chances are good you've got a kid or two playing. If you want to have "adult" chats, do it in a separate room where you can control who sees the chat. This doesn't just apply to children...it applies to adults who may not choose to have to see that kind of discussion.

All that being said, I think that having to give up all MY rights to adult discussions/activities and choices simply because a child might possibly stumble into the situation is unreasonable. To say that I can never engage in any adult talk because someone else might not be a responsible parent is ridiculous. I will be mindful of my situations, and I will personally supervise my own children, but I can't spend my entire life walking on eggshells just because some parents hand their 10 yr old a laptop and let him run off and surf the net.