Why do men live in eternal combat? Even trees strangle other trees when they grow up. Would you ask them to strive for universal peace?
In biblical days, the way to atone for your sins was the sacrifice on the altar to God. What people don't remember now is that the altar doesn't get cleaned afterwards. So with every sacrifice, the altar gets bloodier and bloodier. It's basically a reminder of every transgression and you can't go back to the unclean state.