[frog in a pot]

Point of view counts for a lot in writing history.

As in, for instance, this?
"...they were certainly violent, but so was everyone else at the time -- and still are."

I.e.:
"We must understand that by today's standard the Vikings were normal, I mean one just has to look at high school shootings, everyone has an automatic weapon when all they need is a bucket of rocks, etc."

[FLT-bird]

There was a good 3 part documentary series on the BBC a few years ago called “Blood of the Vikings” that tested locals’ DNA in various parts of the UK. It showed the Vikings’ settlement patterns pretty clearly and was an interesting documentary series. I bet you could still find it on YouTube.