One of the reasons I think 90s media is so fascinating is that a person had basically two choices of entertainment at that point - ultra-wholesome saccharine programming that even the newest installations of felt like they were from a bygone era, or the new trend of ultra-sensational, gritty "realism" that, while technically closer to depicting the world also often dramatized it to a degree beyond what most people were actually experiencing.
That proximity to reality, especially relative to previous offerings, though, gave the dramatizations an air of legitimacy in the subconscious of many viewers that I think paved the way for seeing increasingly more and more extreme events as "normal."
Take, for example, extremes in heterosexual relationships. The vast majority of married couples prior to the last handful of decades had been depicted as happily monogamous, with few and very mild issues. Then, in the interests of telling "real" stories, there was an explosion beginning in the 90s of couples who actively hated each other, used each other, cheated on each other, and controlled each other.
While there is, of course, value in telling the stories of extreme events that can and do occur in the world (especially to expose oppressive relations like those between men and women, heterosexuals and homosexuals, etc), media's concern with rating tends to lead to an oversaturation of the most emotionally provoking content, which can skew viewer perceptions of how common certain behaviors and situations really are. This will and has surely dropped people's inhibitions around negative behavior; they have been both desensitized and rationalized by the idea that "everyone" does bad things sometimes.
And now we seem to be in a place I liken to the old Eddie Izzard (I know, I know) joke about "original" sin: aka, the idea that the goal is to confess the most "original" sin the vicar has ever heard. Many modern (horror) movies and shows are more addicted to the idea of showing you the most original sins than they are with creating relatable characters and lives.
The 90s is interesting in this vein not only because it represents the beginning, but it's actually a little condescending about it too, having had to shrug off the criticism it received in its time by maintaining that anyone who thought they were going too far was simply ignorant and out of touch. You can see the pressure to convert to the jaded Gen X worldview. It's tangible.
If you ever wonder when we all decided the coolest type of person to be was an asshole who only looks out for themselves, it started here, with the decision that the coolest type of person to be was one who rolled their eyes and believed in nothing, on the assumption that everyone already was an asshole.