News (and also Laws and instincts)

As I said before, humans have a natural instinct that makes us to satisfy destructives and "inmoral" wishes. Then it makes me to question to myself if we really need laws, because they just repress this instinct.

I think that the most famous law is that prevents uf of killing (humans, no more). But at every moment there are a murder or a suicide. For example, these days there've been some murders in Egypt because the authoritarianism of his political leader. But it's supposed that murder is never well-taken, so why there are a lot of them everyday?

We always want to get the happiness, and if we find obstacles we'll avoid them or eradicate them, so these murders could be well-taken. But if they are well-taken, we'll be able to admit that all the murders all well-taken, because we won't kill just because. We'll kill to get something that we don't have, to "silence" one person, to take revenge or just because they give us pleasure... But of course I think that they'll never be legally accepted (luckly).

But laws don't prevent it! It's their purpose, and there are punishments but it doesn't matter, there continues being crimes. We could increase the intensity of these punishments, we could especificate so more the laws and also we could reward the people that don't commit crimes, but there'll still being crimes, I'm sure of this. We are animals, and our dams are the humans.

Destruction's instinct

These days I've been thinking about one of Freud's theories, the instincts theory and specially the destructive instinct. He says that humans have a natural destructive instinct, an energy or force that forces us to destroy, to dissolve, to damage...
It justifies sadism or masochism as also our tendence to the wars. As we have the need to join with other people, to love, to feel loved etc. We have the need to do the opposite. Culture've repressed these instincts by sublimation (and other methods). At the destructive instinct, we canalize them by games and sport, and also by using it into ourselves, making us like we feel that we should be (respectfull, without robbing or killing, honest...).
Then, "thanks" to this repression we have an omniscient "policeman" in our minds, and he will ever repress some canalizations of the wishes that we know that we musn't satisfy. I mean, if we wants to kill our father or to robe a poor man, we'll feel an "energy" that repress this wish, and we won't satisfy it directly. Instead of kill our father or robe a poor man, we'll kill a monster in a videogame or to take the football ball from the opposite team. Culture's created this energy, and I think that it won't change.
It's good to have this policeman, or it just takes happiness from us?