And sometimes they ARE products of that environment.
Problem with that is that being a product of one's environment does not in any way absolve them of responsibility for their actions.
Ted Bundy was brought up in an exceptionally abusive environment. It is entirely possible that his unwed mother was made pregnant by her own father, who was the source of much of the abuse in his early environment. Those influences, if true, still do not excuse his heinous actions in any way.
We don't know what influence Little Donnie to lie, cheat, steal, or any other evil of which he is capable; we do not know what early environment caused Moscow Mitch to decide that party and personal gain were more important than the safety and well-being of his own country. IMO, it doesn't matter. Guilty is guilty.