Good point. Genetics is very complex and it is indeed difficult to say which genes are right or wrong.
It is true that 'wrong' genes in nature generally disappear by themselves. The moment humans get involved, it gets more complicated because we simply don't know whether every gene is right or wrong or what the future holds. I think it is never a good idea to breed to extremes on purpose.
I do think that animal suffering is often not seen. Sometimes because they don't know it and sometimes because they consciously look away.
By the way, I don't think my judgment is better than that of others. I like to discuss, I think that can be educational for everyone. I am also prepared to change my position if I get other insights here.