Because thats the concept of omegaverse.
Wait wdym
Rape with an excuse, weak ukes, stronger alphas---pheromonies are basically the answer to everything in omegaverse. The setting itself was created as an excuse for smut and rape lol
Sure, some stories run from the mold and try to visualize how a society like that would function outside of kinky sex, and even less try to have actual commentary on it, but it's no wonder 99% of the omegaverses are just an excuse for smut/rape.
So, basically, if you are reading this genre, expect to run into it.
I get ur point, still there are really good stories that don't include rape and the omega always being weak, I love those stories and would like that authors did more stories like that, but I know it's difficult because it's common to have rape and weak omegas on omegaverse
Why do we always have rape in omegaverse stories I hate that and they always make omegas look helpless as if they can't do anything bc of pheromones