The truth is that there is a genetic component to the behavior of lots of violent criminals -- sociopathy, et. al -- that CAN'T be fixed

It is no doubt that appropriate DNA altering technologies (gene therapies) will ever be available, most likely within next 20 years.

2. Exile to the past via a one way time-gate (as described by Julian May in http://en.wikipedia.org/wiki/The_Many-Colored_Land )

It is impossible at all. Even if you have infinite energy, you can only slowdown the time, not to reverse.