They're systems are protected extremely well actually (encryption and security standards well above the recommended standards). Not every system 100% fool proof and this happened to be the one freak accident.
This is where security is worrisome for most people: Link
1. Doesn't show up in Google searches even searching for the site name directly.
2. Calendar states the site was created just last month
3. No evidence of a sophisticated server as well as...
4. Using a blog optimized web software to host website on a free website to hold data that would be best with a database with indexing features
If you're going to advertise your website (or belongs to your friends), at least have the balls to say it's your/their website that you're making and want people to see it. It's fine and all to explore how websites work in general by making websites even with built in WYSIWYG style tools.
Also, About The "Kids" you're talking about... maybe you should connect your voice in one of Call Of Duty lobbies, and see how they're turning out.
How a completely different service manages their rules has nothing to do with the way we manage rules elsewhere. It's not so much "hiding" the bad stuff and more of setting an example of standards and taking a leadership role on how to conduct oneself.