Personally I think most people got Jasper down a little wrong.
He appears to be neither a particularly bad or nice person: in majority of the instances he's been seen in was him working as a Red Halo officer. "Saving" Katie was simply part of his duties, and whether he likes it or not he tends to do his job as best he can (how else could he have risen to such a high rank?)
Also, he doesn't actually go out of his way to promote the detriment of other characters; while he appears to perhaps milk situations to attain the most pleasure from them, sometimes to the chagrin of more popular characters, he hasn't yet done anything to particularly harm any of them.
In conclusion, he's just another human: selfish, ego-centric and using power to the point of abuse.
Considering his situation, and the very nature of humanity and society at this point, is his behaviour so irregular?