All you have to do is listen to the news every day. You will find that what kind of killers are out there. Also there are very mean people out there that will do anything to get what they want and what they want to do. There is no stoping these evil people and they are in every walks of life. Do you really think things will get better on this earth, no way they can. In 20 yearst here will be more prisons than schools. How many hearts and lives will be shatered in the next 20 years. Only god knows, so mars will be where a person can be in peace.