Well, you are kinda supporting my argument. This isn't about optimism, but military neccessity. If things get that bad that Russia nukes Warsaw, Paris best response is to nuke Moscow regardless who is in power at that time (and with near certainty Russia would try nuking Warsaw and Paris the same time if it ever came to that).
Of course conventional attacks are a different story, where I share your pessimism that western Europe might decide to do too little too late.
Die andere Hälfte hält die Klappe und tolleriert es, was kaum besser ist.