I'm sorry but the use of different languages on RT has been a contributory factor in a number of accidents (in the air and on the ground). That is a fact.
According to who? That is an extremely narrow minded comment!
In France, ATC is provided in English & French.....without a problem. Keep that in mind...
Some Latin American countries also provide bilingual ATC. Correct if I am wrong, but I was told that ATC is bilingual in mainline China.
I fail to see where the problem is?