Chick culling is certainly gruesome, but not so shocking to me. It terms of animal suffering, I have seen much worse, still not enough to stop me from eating meat though.
I've seen videos of these chick grinders, from fully live chick to ground meat, it takes something like 1/10 of a second, I am not even sure their brain have time to register what happens before there is no brain anymore. Culling also happens very early, maybe after a day or so after hatching, so early it could almost be called abortion. Considered what happens after that, if I were to reincarnate, I would rather be one of these culled chicks than one that survives...
I think that focus on culled chicks is more because it looks ugly than real concerns about animal welfare.