Those are cool and interesting theory's but I think you would agree it is a lot a lot a lot more complicated. R1b in the Near east and Europe is almost all under R1b1a2a L23 which started maybe 10,000ybp. R1b1a2a1a L11 did not arrive into western Europe until 5,000ybp R1b1a2a1a2b S28 probably did not spread into Italy and most of central Europe till Urnfield culture from 3,200-2,730ybp. Plus the Germanic and Italo Celtic tribes who conquered western Europe so you would put them as the aggressive war like kind of like Indo European branches of R1a but they also had maybe 30-50% of other haplogroups it is rare to find anyone who is 60% or more under one Y DNA haplogroups. I think the reason Germanic Italo Celtic R1b1a2a1a L11, Balto Slavic R1a1a1b1 Z283, and Indo Iranian(maybe also Tocharian) R1a1a1b2 Z93 conquered is not because of their haplogroup but because they are all Indo Europeans and have similar cultures. Russians today are known to be tough but they were beat up pretty well by the Vikings well almost everyone in Europe was. There is actulley a Russian family who told me traditional Russian folk stories about very big warriors who used to raid people and they said their Vikings I don't know it would be cool if it was. The R1a1a1b1 Z282 eastern European tribes from what I know did not defeat Germanic tribes Vandlas and Goths and really no one beat the Huns. I don't think you can declare one people groups is natural more aggressive than another or has a certain instinctually personality. There are some stero types of French being spoiled bratty wimps and their Gaulic ancestors were known as some of the most war like people in the ancient world. And Romans and Greeks saw them as primitive and wild. Look at European Royalty traditions how fancy and organized it is and I am pretty sure it goes back to Franks and other Germanic western European kingdoms in the early middle ages. Then when you compare those Germanic kingdoms like Franks the description of the Rus Vikings according to Ibn falden they were very dirty and primitive and nothing like that even though both Rus and Franks were Germanic.
You made the point in a thread how modern Italians traits don't really fit Ancient Romans. I don't think we should generalize characteristics of people groups because it is really complicated they wont always fit into a certain stero type.