Is your cognitive dissonance that strong that you don't see that if all major countries follow that line of thought all have to have their own golden domes and invite WW3?
How does everyone having golden dome invite WWIII? We can't shoot missiles at them, so therefore let's go start a war with them? What sense does that make?
And if we do, how are we going to fight them? By shooting missiles at them?
I don’t think that’s an appropriate use of the term ‘cognitive dissonance’, but suffice to say, no, if the US develops the Golden Dome as currently described there is no danger of all major countries also developing the same technology and then starting World War III.