If white people rape, murder, pillage, and steal the lands of non-white people that's bad and those people are genocidal murderers.
But if white people rape, murder, pillage, and steal the lands of other white people that's ok and its celebrated.
The Vikings were a bunch of raping murderers and yet they are held up as some shining example of brave and noble warriors. If we are going to change the names of sports teams for being offensive, then nothing is more offensive then a team named after a group of people whose entire existence was dedicated to rape and murder for the purpose of stealing other people's belongings and land.
This is one of the reasons I could never get into watching Vikings the tv show. I just never saw the vikings as some people I want to root for and romanticize their side of the story.