One does need to remember that language facility is quite variable in people. Also -- perhaps more to the point -- once one has gotten beyond five or six years old, some sounds are just simply not available to the individual. Very few people from the anglo-saxon/germanic language tradtion, for instance, can pronounce French (or other Romance languages)(never mind the Slavic languages) properly -- and, I might add, vice versa. Oriental languages are full of sounds which no westerner can do properly -- and again, vice versa. And so on.
There are a lucky few who can manage to cross language group boundaries. If you are one, be happy -- but don't sneer at the vast majority of those who can't.