What I'm saying is it's better that "some" people don't know English. I don't know what number constitutes or what % of people but by having some people -- for lack of a better word -- "corrupted" by English will have new perspectives. We need lots of languages and lots of combinations of these languages for a healthy world.

I say this as a monoglot English speaker. I have some French and Irish but both are very poor.

If I had a choice between being better at English and being better at my native language, I'd chose the latter. Realistically though it would be much easier to become less bad at a second language (lot's of low hanging fruit left) than to go from regular to exceptional in you mother tongue.