My cat definitley kills for fun.
She drags birds into the kitchen, bats them around on the floor for awhile then just leave them there to die. It's disgusting.
I could easily call that territorial. Cats are very territorial, and do not like other animals anywhere near their territory. If they deem it theirs, there better
not be another animal around.
So no, your cat does not kill for fun. You simply don't understand the reason as your brain is not developed to understand the nature of every species. Even if you studied them for a long time, your brain is indecisive towards their actions as you are not developed for such communication.
Watch this TED talk:
http://www.ted.com/talks/henry_markram_supercomputing_the_brain_s_secrets.html
He touches on why we may not be able to understand animals, and such.
Someone previously said if two people love each other they should be able to create offspring. I disagree with this statement more than anything else. Love has nothing to do with mating, at all. As a child, you're taught that love is important, and you value it because (in most cases) your parents showed you love and brainwashed you to believing it was important.
A lot of you are arguing that cousins should not be allowed to marry based on the idea that they will have offspring, rather than the idea that they'll simply get a financial break. The thread didn't ask if you think cousins should be allowed to have sex, and have children, it asked if you think they should be able to marry.
On that, I say yes. There is no reason why marriage should be a sacred act, as the government has adapted it for tax purposes, and other such evil government things. So, if cousins wanna get involved in that, let them. If two men, or two women want to... let them. It's not our choice to deny their request.
On the topic of breeding, I'm sort of pro-life in the sense that I don't agree with parents choosing for future generations. I don't think just anyone should have the right to create a human being, as there's always a chance that the human they create lives a horrid, and painful life. Though, limiting the freedom of the two parents to do so is also, equally 'wrong'.
Note that genetic defects can happen in people whose parents aren't related by blood. Also note that our population was half of what it currently is merely 40 years ago. There's no way we aren't all related by now, in some way.
So, marrying cousins? Sure, go ahead.