Our system has that built in. You can only be punished as to the norm and standards, findings can create precedent for other cases, etc. The workaround is they just use an 'as applied standard' so that it only can 'apply' to the one case due to that case's unique 'circumstances'. They do it all the time to prevent precedents from being set. 'As applied' rules are excluded from setting precedent.

As applied needs to be changed so that it can be included in setting precedent and when considering the norms given out for punishment because right now it's highly abused to prevent establishing legal norms from judicial findings the way our system is supposed to.