You talk about it like all scientists could ever agree to something and that it would be possible to poll every single one and properly weight their individual scientific relevance.
An entire country being contrary just because of national pride and arrogance is completely different.
Is it your position that all countries should have the same language regardless of their cultural history?
Also, it isn't rooted in national pride or arrogance. Aluminum came first and was the name given by the first chemist - a British scientist - to isolate the metal. The variant aluminium came from a reviewer who changed the spelling just because he liked the sound better. Aluminum was recognized by ACS 65 years before IUPAC standardized to aluminum. IUPAC has recognized aluminum as an acceptable spelling since 1993. So yeah, the general concensus is the aluminum is okay even based on your logic because IUPAC says so.
The American spelling matches the American pronunciation, and it was one of the original variations of the word. Americans didn't pick it out of nowhere.
That's more akin to saying "it's spelled aubergine, not eggplant, you stupid Americans".