Even if the pirates killed all the Vikings, the Vikings had a better afterlife.
Valhalla: Boozing, carousing, quaffing, fighting, eating the never-ending roast pig, more boozing…
Pirates: Either burning in Hell for all eternity or sitting on a cloud playing a harp.
Of course, the pirates could never kill the Vikings, 'cause the Vikings would kick their poncy little asses. Plus the Vikings had rune magic; the pirates had, what, talking parrots?
Damn straight. In fact, Vikings were a huge political influence in Ireland long after the pillaging days were over—it takes a bad-ass to keep political power in a feudal world for centuries after pillaging (and settling) have ended. And the tour was a blast!