I don't get how anyone could not get the association. You fly a flag--any flag--and you endorse what that flag stands for. That's where the phrase "showing the flag" somes from. That's what flags are, after all, all about.
Do you /really/ think that the skull and cross bones still stands for "rape, robbery, plundering, and murder"? Really? Still today? Or, maybe, does it stand for something else today than it did a few hundred years ago?