here's the link to the shirt, you can see the cross in the second picture showing the back:
Most Helpful Guy
The intention of this shirt (and the whole product line, for that matter) is to offend certain people (the very up-tight, who are also "moral leaders" or at least see themselves as such). And by offending those people, it serves to separate and intentionally marginalize the wearer from mainstream society. In that way, it isn't a lot different than a tattoo, a body piercing, a leather biker jacket, or anything else that is readily identified with an "outcast" group of people. And while tattoos and piercings have become much more mainstream over the last 20 years, make no mistake that there are still large groups of people who don't like them, and see them as amoral and offensive.
Usually, people who choose such clothing or other "identifiers" are looking to belong to a smaller, intimate group that enjoys rebelling against the mainstream, and grows closer to each other though that collective rebellion. Those groups are often called "cliques", and it's no accident that this very name was taken as the name of the shirt.
The shirt doesn't bother me - I'm fairly immune to such stuff, and see it for what it is - but I'm hard to offend in general. But make no mistake, it was designed to offend a particular group of people, and it will.