It is disgusting how people treat some animals, you are not an animal and have no excuse other than bad upbringing to warrent such outlandish violence.
And you're just a pussy that can't handle blood.
If it doesn't have rational thought, it's not that horrible to kill it. Abortion should be legal until about year 7, maybe 5. After that, the child's a human. It can read and think and do simple maths.
As for animals, they're just animals. They feel pain, but they can't do a whole lot to complain about it. It's far more important to be familiar with killing, skinning and fire than be scared of violence and predation.
Next you'll be condemning lions because they eat gazelles.