My own opinion is: Yes if we can bring back Cavemen, and those sacrificed, or killed for stupid beliefs we should do it, but what should we do if some crazy guy brings back People like Stalin, Mao, Genghis Khan, (Hitler is no option cause he is completely gone) some ancient tyrant?
What should happen to Stalin if he goes on a shopping trip to Moscow, or to Francisco Franco if he is spotted in a Cafe in Barcelona?
Should they be put to trial and sent to prison?
Pfft, such a pessimist! :^P Look on the bright side: we could bring the greatest minds that ever lived. Feynman and Einstein and Marie Curie working with quantum computers; Bismarck and Theodore Roosevelt maintaining the worldwide balance of power and making wars obsolete; Austen, Keats, Heinlein and Hemingway creating the masterpieces they never had the time for; Da Vinci and Tesla (f*** Edison) coming up with technology we can’t even begin to imagine… And just think of interviewing all the less famous revivals - we’d be able to solve every mystery there ever was, fill in all the blanks and teach history the way it really happened. (Lost colony of Roanoke, anyone?)
Sure, the transition from one era to another would be quite a shock, but if it were set up as a gradual process, it might be doable. Has anybody else here read the Transmetropolitan comics? They have an issue dedicated to this exact dilemma: cryogenically frozen people from the 20th and 21st centuries get revived sometime in the 24th century but nobody cares about them; most of them go insane after they step out of the revival facility and see how different the world has become. :^/