And thus if recidivism stats figure out 3.5 months in prison are enough, we see blood revenge coming back.

As well it should. Frankly 3.5 months aren't enough for deterrent, and are almost certainly not enough to prevent recidivism. Let's put it this way: if the stats say 3.5 months are enough to prevent recidivism then the most likely explanation is that the stats are bogus.