I see it a bit differently. I think the media (radio/ TV) resisted displaying all content that could even hint at there being an ugly side to the human psyche, back in the adoption years (early 1900's) on into around the time of the big war in Vietnam, and that the coverage of the disgusting acts in that war finally opened these avenues up to exploring our "shadows" (dark side).

I'm of the opinion that we each need to look at that side of ourselves in order to be powerful individuals, with the freedom (within our own psyche) to react appropriately to the conditions of the moment, as opposed to being stunted by a lack of self-awareness, which is likely the reason (lack of self-awareness) why we've collectively allowed so many evils to rule and govern society, in the first place.

Whatever the intentions of those who choose to demonstrate the shadow side of human nature through the medium of TV, and despite there being obvious negative consequences, particularly among a small subset of viewers who are negatively conditioned by watching this type of content, having this content out in the open is a net positive as far as I see it. We can't hide from our dark side and expect that things will be positive because of it, the opposite is always true. Instead, we need to especially focus on that side of ourselves, which something like the TV series that you mentioned helps us to evoke, so that we can be aware of the totality of who we are and, more importantly, open up access to the understanding of why it's there and of what use to us.

The knowledge that is inherent at that level of understanding gives us both the clarity and power necessary to EFFECTIVELY guide our instinctive drives, many of which we'd label as "bad" or "evil", in a way that truly benefits oneself and society, as opposed to unconsciously running away from that knowledge at the cost of being a constant victim to bits and pieces of that evilness leaking around our attempts to appear good (both, or either, to ourselves and/or others), mostly without having any control over them.

To put it more succinctly, we're more effective, logical, reasonable, natural human beings when we are no longer at conflict within ourselves about our true nature. To hide from a part of oneself is to lie to oneself, but, more importantly, it's to remove awareness from one's inner power to control and/or "transmute" evil forces that lie within the psyche. It's to be at the mercy of these forces, unarmed with the knowledge necessary to overcome them, completely ignorant and, quite frankly, psychologically weak.