I've thought a lot on this topic. Is what we are defined solely by the combination of external stimuli and our initial state? If this is the case, would that absolve murderers? Would it demerit 'heroes'? What knowledge I currently have on this subject is worth roughly nothing at all, and so I have decided I am not allowed to have an opinion on the subject. I have also decided it is ultimately pointless.
The most bizarre phenomenon I have encountered is the strange way the public seems to feel toward explanation. Let us assume that your view is in fact correct, and turn it back upon the punks. Understanding that societal pressure caused them to become who they are does not absolve them from your or my scorn. It only makes sense to scorn people for bad behaviour, because then operant conditioning works to change them toward presenting a more desirable societal image. (Hey Billy, is that not amusing coming from me?)
Many people, unfortunately, let their base instincts rule them in ways they don't perceive. I doubt any of them in the car actually dislikes joggers, but instead have friendships similar to the relationship tyrants have with their country. By turning eyes outward toward a common enemy, local famine can be more easily ignored.