There's nothing immature about it. The Hype is a sub-society that, in its own strange way, mirrors real-life scenarios.
If a professional athlete is caught using performance-enhancing drugs and then kicked off a team, that person's action will not (and should not) simply be brushed under the rug. It will be addressed and discussed by his teammates, along with the fans and media.
Let's say a group of friends go out drinking one, and one of your friends gets into an altercation with an annoying *****ebag who was starting trouble with your group. Should you and your friends not discuss the *****ebag's antics amongst yourself? Should you say nice things about this person or somehow feel sympathy for them?
Here at the Hype, the general immaturity comes from those who are immature enough to break the rules and get themselves banned, and it's not as if these people just get banned immediately. Some of them last for quite awhile here and leave lasting impressions on the other users because of their generally unpleasant demeanor or irresponsible actions. I fail to see what's immature about discussing ANY person, scenario, or altercation that passes through the Hype. When you sign up and create a username, you are, in effect, putting yourself out there to interact and potentially be remembered. You are choosing to express yourself in a certain manner. If ths wasn't the case, none of us would have usernames or avatars and we wouldn't be able to reference each other by name.
Anyway, in conclusion, talking about banned users is no more "immature" than, say, whining about girls who won't date you over the Internet. If talking about banned users can be considered immature, then that would essentialy mean everything we talk about here makes us immature.