Just as I reject that our only options are to either screw over fishing communities or do nothing, I reject that our only alternatives are violence or doing nothing. I don't believe there is a single solution which can be applied in all situations that would resolve this, it would need to be worked out on a case by case basis and in cooperation with those communities. But just because it is complex and difficult does not mean it doesn't exist, and the alternative is an ecological collapse which we are unlikely to survive.