Killing is fun and its normal. Every human should kill another in their lifetime. Its a great way to relieve stress. You can also learn about a person's body if you take it a step further to torture them or cut their chest open. Its an evolutionary flaw for us to care about others feelings and if they're in pain or not. Its an evolutionary flaw for us to feel guilty or remorse after torturing or killing another being. Rape is good for the soul too.