Time travelers from the future are all hipsters: they knew our future, or their history, before it was cool to know what will have happened. Or they don't give a crap about enlightening prepolyhistoric people, "they'll figure it out eventually." Or just no one cares. Seriously, you're from the future, and you travel back in time, would it be to: A) Tell people who the next pope will be, for... reasons? and risk being tracked down by those time-cops that may will have to exist depending on how time travel affects the relative future. Or, here's one for you paranoid right-wingers: You are forcefully aborted in your mother's womb by the time cops as capitol punishment for abuse of time-travel; B) Alter the future-past to advance treatments in cancer or whatever so your dad will live a few extra years as you personally spend decades of your life with our prepolyhistoric craptacular technology; C) Live the good and simple in Wyoming under an alias that the government will probably track you down for not previously paying taxes; D)Run the Biff on lotto and sports.