man....i guess as long as you're fish man your and fighting near water you are safe from any danger and even yonko, that's why your island doesn't need any protection from a mere yonko like whitebeard, wait....
seriously this one piece fanbase is so reek of blind fanboyism, they Always find excuses to justify dodgy writing from their favorite author, just admit if your GODA made same silly choice and move on, one piece is not going to be a garbage manga just because of some shit writing here and there, it's still the best of the big 3.