We are all born with flaws. We are all born with propensities for sin too. What separates us is whether we allow our propensity take over and lead us into sin or if we learn to control our lusts and desires to live a virtuous life.
The pyromaniac that says he cannot control himself is trying to minimize his choice to let his lust for destruction through fire overtake his knowledge that it is wrong.
The kleptomaniac who steals and claims he could not control himself is only trying to alleviate his responsibility for his actions that he knows are wrong.
The serial killer is the same as the kleptomaniac who is the same as the pyromaniac and this goes on for every other sin.
Those who pat them on the head and tell them it’s not their fault are nothing more than enablers. Why they enable I do not know. Maybe to cover for their own sins?