You're only arguing the motive of the person who set the American English precedent. It is what it is today, and it doesn't cause the problems something like measuring systems so actually cause.
Well, personally, I don't see why it's not corrected since it would be a rather simple thing to do, but fair point.
Also, at least US English sometimes brings the lulz in a non-I'm-mocking-you sort of way. I loved all the "Tire" Centres I saw over your way.