The best defense is a good defense. Don't count your chickens before you learn basic addition. Crime doesn't pay. If it did, felons would be audited. There are other fish in the sea, many of which are sharks.
War is hell.
A snowball has no chance on a battlefield. Sticks and stones can break my bones, but names just put me in a psycho ward. Russian roulette is more challenging with a semi-automatic. What's good for the goose is good for the gander, except maybe childbirth. If you play with water, you get wet.