Pirates still ply the high seas.
[southfront.org]
I've seen many videos on YouBoob of antipiracy actions by several navies around nominally Muslim nations' coastlines. Just as the Barbary Pirates of North Africa 220 years ago, todays pirates are driven as much by ideology as by greed.
I believe that ideology is way down on the priority list for thieves. Some ideologies might require a bit of honor, thievery requires none.
@lawrenceblair Some ideologies require dishonorable treatment of "infidels."