My original het albino male was aggressive. Half of his daughters where regular hissers. One of the two offspring of one of those hisser daughters was extremely aggressive. I've culled the aggressive ones from that line out of my collection (but I still have one aggressive daughter of an unrelated non albino gene aggressive female).
So, in my limited experience it sure looks like aggression can be genetic (some sort of dominant) but isn't necessarily attached to the albino gene (it was actually the two non aggressive daughters of my original albino het male that proved het albino and the two aggressive ones didn't). I think it's just that some breeders might have selected aggressive balls to found their morph projects due to the belief that aggressive animals are better feeders (arguable). It might have been that they where trying to make ball pythons more like more aggressive and better feeding species they where already working with when the first morphs came on the scene and ball pythons where first bred in numbers in the 90's.
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