This TL has made me more sympathetic with nationalism than I'd previously been. While being of German descent, and 100% sympathetic with OTL Germany right up until the holocaust (in all openness including war to regain lost territory in Poland and France), I was also born and raised in the states, and it seems that the latter wins out (also an interesting perspective on 2nd gen immigrants in time of war). While I don't support killing civilians, it is, undeniably, a militarily effective tactic. Very low costs on your end, and the enemy is forced to expend orders of magnitude more resources and time. If you want to make something painful, and hideously expensive for unpleasant people, you're hard pressed to beat a terrorist campaign. History has born this out.