Let's play devil's advocate for the sake of discussion and understanding.
We can hunt for population control because there are too many.
Animals are run over laying on the roadside everyday. Others get taken to a clinic and killed because we just don't want them anymore. It's apparently ok if it's a possum or an armadillo, but sadder if it's a cat or a dog.
We can take a hammer to the skull of a cow, slit its throat, hang it and let it bleed. Mutilate it and cut it into pieces. Shred it into hamburger. You can't touch it's genitals. You'll go to jail for that. You can stick your dick in hamburger if you want though. That's ok.
Try not to take a stance of morality, but please explain why some animals are different and deserve more respect or why it's ok to slaughter something but sex gets you jailtime. Is it ok if you plan to kill it and eat it afterward ? It's not so "inhumane" then ? Is it more or less about what we feel we can justify ?
Btw, I didn't see the cat video's. I don't believe in causing harm to an animal. It's a sad thing.