I don't see how killing a lot of fishermen and destroying their families alleviates this pain.
There might have been drugs on the boats, but maybe not. No one bothered to check first.
The fishermen might have been part-time drug smugglers, maybe not. How do we know? What investigation was done?
And if we really believe that "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness"
then taking away people's lives without due process is murder. Cold blooded, premeditated murder. That's a worse crime than selling someone a drug that might kill them.
Friend, don't let your pain blind you to causing more pain. Ethics is hard.