Again, whilst he has always had "issues", I do think we need to beware of viewing RW's whole life and artistic output though the prism of the 80 year old pro-Russia (and at least borderline AS) crank that he is now.
There were widespread accusations of British incompetence and even callousness as far as the Anzio campaign (where his father perished) is concerned, and of course the son of Commander Waters was well aware of this. Plus as far as WTTBF is concerned, I don't think he "blames" George VI for the war, rather its a dig at the obvious insincerity of his "rubber stamp".
Its one of the most powerful lines in a generally brilliant song IMO (and a lot of his output at that time *was* pretty self-indulgent - Two Suns In The Sunset may just be the most wrist-slittingly depressing thing ever put to vinyl)
Yes it was one of the justest wars ever, and we were the good guys. That doesn't make everything the Allies did beyond criticism, or alter the reality that war is by its very nature horrible and hellish.
So he gets a pass from me tbh. Oh, and I also quite like The Division Bell