But with murders they have an objective statistics that murder rate fell to zero, which is pretty cool by itself. Most of murders are not premeditated. I guess stopping people who in head of the moment would kill would be enough but they weirdly went further than that. In the beginning of the movie guy was going to kill his wife, if you believe technology of predicting future they have.

I think the point was they had no way of knowing, and that free will is real so it is wrong to punish someone deemed to be fated to crime.