Ok, so while this great in a sport application, in a true violent situation it's not so good. The idea isn't to make your opponent better, it's too totally make life altering changes in his body, and attitude.
Hey Nicholas

So imagine your ,"J-The Super Martial Artist Vigilante", and you hear about this crack house down the way. The cops have been in and out of that place several times, and no one ever gets busted. In this scenario we'll say that the cops are viewed as corrupt by the general populace. SO you decide to take matter into your own hands. You get dressed up into your coolest ninja outfit, with all the nifty little weapons...
I understand that in your scenario, the law enforcement are in some way corrupt, though fiction aside, this is not a necessary condition for the victim of a violent crime to feel inequitably treated under legal process. I wonder would disproportionately low custodial sentencing not be a more significant factor in the perception of unfairness by the victim? Nonetheless, your story is certainly entertaining and but I wonder is the moral lost in the flamboyance of the scenario? I think you and I have perhaps visualised the vigilante in different ways. While I am happy to accept the notion of the "Caution: Superhero Town-Cleansing in Progress" vigilante that you presented in your outline, I had been thinking more of the individual seeking retaliation on their own behalf or that of a loved one, against another individual: their attacker.
I take your points though that vigilantism is ill-advised. I have no argument to make against that. My point would simply be that vigilantism for an individual is a valid mindset that can follow from the perception of unjust legal process.
Thank you again for your post Nicholas. You have a talent for screenwriting I think


Yr most obdt hmble srvt,
Jenna