Infinite Stupidity

Novikov self-consistency principle – A theory stating that if a traveler through time (outside of the Many-Worlds interpretation) could create a paradox (by killing their own ancestor, for example), the probability of that event happening is zero. IE, a person could not go back in time to kill Hitler, as a paradox would be created where the person would find no need to go back in time to kill Hitler, as he has already been killed. Therefore, anything that a future time-traveler will decide to do in the past has already happened as part of the timeline, for example, the time traveler has failed to kill Hitler in the past already.