"I'd like to see vigilantes form their own gangs and take out the trash...
"
I don't know... P'od law abiding citizens. A little cowboy justice.
But have to catch them right in the act. Bring video cameras for court. Don't instigate, wait for them to attack the group or inncocent bystanders.
In a gang war, let the two gangs fight it out, swoop in and finish of the rest.