Freedom of will versus the prevention of atrocities

[kajarainbow]

If you had a method of making people nice, or at least making them not do the really terrible things that happen everyday (carnage and suffering around the world), is it morally acceptable to preemptively use it on everyone and sundry? Is it okay to use it only on proven offenders?

Does the inviolability of their psyches outweigh making the human race far better off?