Deepwater Horizon was, herself, registered in Majuro. I'm a big fan of cabotage restrictions, myself. No one benefits from local mariners with local knowledge and local concerns getting replaced by (potentially) mal-treated or less-than-invested mariners in the local waterways. If halibeerhoustonpeewallstreecorp coral atolls incorporated had screwed up one of my coastlines I would be so angry. I am angry. You're angry, too. We should all be angry about this. Its justified.
But mariners, what ever port they call home, are not the enemy here.
The problem is at the owner level. What law-abiding corporate culture are you operating under? What laws are they obligated to follow? No matter the nationality, if you give them a loop-hole they will take it. I like my system because its the one that I have influence over. That is the power of cabotage. That is why US and Canada (and probably some other places) should have strong cabotage rules. Because our values can become our laws; and that can improve conditions for us, and also for the international crews that we interact with. Isolationism decreases our moral power. Engagement and backbone make things better for everyone.