"Those who seek to predict the future... might first look to the past. The past is a mirror -- and those who ignore its sometimes dark reflection, are doomed to repeat it."
The first outlaws to be given these powers are two two friends, Frank and JD Kelton. Frank wants to use them to rob people. Later in the episode, the visitor gives the powers to two brothers, Jake and Ben Miller who use them to rival their ex-partners.
After this, the visitor explains to Jake and a woman who witnessed the violence his reason for coming to earth, and giving them this power.
Jake asks him, "All of these people, dead, for what?" He then shows them that he is an alien, and tells them that he is scouting ahead to see if humans will ever be able to rival his civilization.
"The fate of a world isn't determined by its best examples, but by its worst. It takes a few to destroy the many, especially when even the best of you can be dragged down into the mire. Judging from your example, brother against brother, friend against friend, you people have such a potential for violence, sheer, unvarnished wickedness, I've got every confidence you'll destroy yourself before you build your first inter-stellar engine. We've got nothing to fear from you."
He then disappears.
"Will it be those seeking redemption who shall decide the future... or will those driven only by greed and envy shape our destiny? Even a hundred years later, the outcome is still very much in doubt."