It’s beyond the point in terms of whether we should revolve our national security around it. You have to be prepared for everything. I could ask the same question in terms of “when’s the last time somebody launched a nuke at us?” Now, does that mean we shouldn’t take precautions against such enemies?
Is there no way to compromise with you? I’m not saying, “Opps… one of our subs hit a whale - let’s decide to scrap the entire navy since saving the whales is… ummm, good… yeah… good.” But as F_alk pointed out, is the 60% of the open seas good enough for you? Especially in times of peace, can the Navy at least show some restraint? I’m not saying, lets stop using sonar, but to limit ourselves in accord. And I’m sure your point about “revolving our national secruity” is beyond the point as much is mine. And what’s to stop us from the nth degree? If Country X could one day be a threat to us, whats to stop us from conducting war games off their coast? Afterall, we have to be prepared for EVERYTHING. Compromise. It’s not just some word.