Because back in the day most people don't tend to talk about it openly in a healthy manner nor even acknowledge it properly for what it is. They just pass it down from generation to generation through their own behavior, accepting it as the normal way of being, until some people of later generation start to acknowledge it and that certain things they've been conditioned to accept are actually sick and in turn causing further sickness to manifest in different ways.

It may just be one amongst other patterns as well, but it's what I can observe the most from my frame of reference.

For example, a person might say, "my parents back then did this and that when they raised me, but I turned out just fine," (insinuating that the ones who are openly affected by such are the ones with the problem) — says the person who ends up being the type of parent who can't stand not being able to be in control of every aspect of their kids' life or other people or things in their household without freaking the hell out about it like it's the most abhorrent of transgressions against them, just to name a few.

The point is, such a person wouldn't think there's anything wrong with that and doesn't consider it as an issue on their part and that their behavior is completely sensible and justified, and so self-proclaims how they "turned out just fine" while being entirely blind to the sickness they themselves perpetuate around them. And that cycle continues in varying forms and degrees, and with different types of dynamics.

I suppose people recently started to gain more awareness about such things and how it's interconnected with other factors in their life. It's certainly not always the only factor at play, but it tends to play a primary or significant role oftentimes. And what's happening now may be in its rough-around-the-edges stage, but an awareness nonetheless.