Let me get this right YOU bastardise OUR language and say that we use peculiar pronunciation. LOL that is so precious - I'm going to print and frame that one.
Bastardize? Us? Hardly. It's a bastard language right from the start. It's nothing but an overelaborated pidgin which eventually turned into a creole. So don't get get too smug about it. Furthermore, and quite aside from its lowly origins, there are some reasons to believe - though I doubt you've ever heard of them - that American English is much closer to the English spoken in the colonial period than anything spoken in Europe today. That makes the English version of English somewhat degenerate, though I was too polite to use that word.
So tell me, which pronunciation of English as used in those tiny islands do
you consider correct? There's something of a variation, as you've doubtless noticed. The US, despite its relatively vast size and population, has less variation - one of those reasons for believing that it has degenerated less over the past two centuries.