Lawrence Keeley notes the same thing about archaeologists and pre-history ruins. There was a concerted effort to find explanations that did not involve obvious conflict and war.
http://gunwatch.blogspot.com.au/2018/04/book-review-war-before-civilization.html
It won’t happen in my lifetime, I hope that someday historians will step back and look at what we really KNOW and just try to tell that story. But for over a century (at least), most historians have been telling whatever story they wanted to tell (usually to advance an ideology) and they have simply twisted evidence to help themselves along.
At some point, there will be a renaissance in the field that might get us closer to useful truth. This is also true in Psychology, which could be a good field, but which is largely today just political posturing.