Lex talionis/revenge should be the only form of justice for assault, battery and murder cases.

Okay, we heard of extremely horrendous cases like that mass stabbing in Southport where that asshole was sentenced to 52 years in prison. Alongside similar cases where the killers just get sentenced to life or have death row for years when caught , well why not dispense with that and have swift and sure death or revenge as soon as the sentence is proclaimed in the courtroom with the victim or the victim's associates such as families being allowed or even forced to take their revenge or do the exact same thing onto the criminal/criminals themselves as soon as possible. Swift and sure and the taxes spent caring on those monsters can be redirected into other things like healthcare and infrastructure.

Rehab should only be done on those that deserve it and violent crimes don't deserve the mercy.

But what about mistrials? Punish the judge or jury presiding over the mistrial with jail sentence or the death penalty . And what if they don't have willing volunteers? Well, press gang lawyers and people from the street to serve in the court as judges and jury members respectively.