Guy from the 80 said:
Since my native tounge is not English perhaps...
Just out of interest, what is your native tongue, because I'm betting that unless there are only a million or fewer native speakers of it, there will be regional variations if not dialects of it.
If you speak in a horrible accent, why not change it?
Well, good luck to them if they try... not everyone can afford a voice coach, and even if they can, I don't think many have the patience to voice train themselves.
Also, what is Charles Dance accent called?
That (I haven't watched the clip, but I can guess) is plain up RP...
Anyway, don't forget that there are nine countries (at least) for which English is a de facto (if not de jure) primary language of communication and government, every one of them has their own distinct set of accents, so all told, there are a good couple billion people who speak English as a first language, wherein there must be hundreds of different accents. It's just the way the penny drops, mate. I'm sure pretty much every state in the US has their own set of accents, every county in the UK, almost, has its own set of accent/colloquialisms.
Besides, how charmless would a country (i.e. England) be if everyone spoke RP?! Fucking hell, it's bad enough that Hollywood has already stereotyped Brits as haughty up-tight twats with a rod up their arses and this is purely from the accent, it really would be crap if that were a reality!