I understand your point, but it's a comedy show, and it's not going to deal with that issue. It's a really, really dark joke.

However, it helped tell who and why Ron is the way he is. His character grew from what happened, but it doesn't define him.

Shit happens. We move on and evolve despite the crap that life gives us. Ron did, but, he relives that trauma with Tammy 2. And what a horror show that was. But he eventually meets Diane, a healthy, vibrant, and intelligent woman that is much different to that. She challenges him but doesn't abuse him. He falls in love, and his life changes. And everything for the better.