In the long run, we're all dead. So I focus on more immediate goals. I presume that you do to, otherwise you wouldn't work to buy food to live.
That is actually true, but I do attempt to consider the effects of my actions on the present and future of others. We leave a legacy.
One of the most direct results is that I assign the extinction of militaries and arms races a very high priority indeed. Only drug use comes anywhere near in a list of humanity's most destructive endeavors.
It's a judgement call based upon personal values. I find the Nazis & Imperial Japanese to be far worse than the Allies.
If we go by the immediate results in the 1940s and taking for granted that the war is already an unavoidable reality, most certainly.
One has however to wonder whether the Germans and Japanese even have it on them to blunder quite so spectacularly as to make their hypothetical triumph in WW2 a clear bad thing for the world of today.
Would a world where Nazi Germany and State Shinto lasted a while longer have kept them for much longer? Probably not.
Would such a world reach the 2010s with situations worse than ours? I just don't know. It is certainly not clear that it would. We have Guantanamo, we had Iran-Contras, we have around a trillion dollars wasted in attempting to make so many people killed and made miserable that Iraq became a Shia regime as opposed to a Sunni one. We have many Israelis apparently sincerely believing that there is no big moral deal in killing Gazans for the pride and safety of the country. We have Americans saying out loud that air bombings save lives. We have the USA all but doomed to rely on the military industrial complex in order to remain economically viable.
That is way too much bloody insanity for one to seriously say that the world is better off because WW2 went the way it did.