Anyways in my honest opinion I think violence is vital to human society, but needs to be exercised in a good way. Violence and sex are not bad as long as you do not force it upon others. Rape and Murder are deadly aspects of sex and violence, but we need to look beyond that. If you have a lot of aggression and want to use it upon someone, find someone and ask them to fight with you for fun

. I know that may sound very odd, and many people think that no one would accepts such a thing but the truth is many men (and some women) do like to fight for fun. I surelly do

. Or instead of risking getting hurt in a unorganized fight, join a combat sport such as boxing, wrestling, or MMA. The bottom line is that violence (like sex) can be an okay pleasure as long as we do not force upon others.
Of course self defense is another reason to use violence.