Umm... why are we drowning the kittens? If there was a reason for it, aside being a sadistic freak, then drowning said kitty cats isn't immoral. If the kittens had rabbies or distemper, then drowning them is a good idea- but you'd have to burn the corpses to be sure. Kinder than just tossing the live ones in the fire.
With rabies, it wouldn't even be safe to touch them- you'd have to burn the clothes you wore when disposing of them. And don't you even DARE say that a deadly virus deserves better- not dying is the best reason to kill something.
And why do you need all this "backing up"? These things are based on dispersed factual data, you can find the info for yourself. I'm not the one who needs to prove I'm right, you're the one who needs to prove I'm wrong. You find the example of cattle living in the wild, and I gave you the only known one, and showed how even it wasn't working. Look up stuff on the cows in india. We know you have the internet- and you seem smart enough to do basic research. Why should I do your job?
Animals are animals, people are people, and maybe I'm speciest. I'll consider any equal species an equal, and all inferior species inferior. I see no reason to cause undo harm, but why go out of my way to help something that wouldn't bother to help me?