Language is indeed for the purpose of communication and understanding, but it is not *only* for those purposes. It is not only for the purpose of communication. Language is also for the purpose of maintaining identity. And English is destructive to the latter. By wiping out local languages wherever it goes like an invasive species, English is actually having the effect of reducing international peace and understanding.
Toronto nightclub shooting leaves at least 2 dead, 3 wounded (AP)
from the article: Only 40% of ultra-Orthodox high schools in Israel teach English and math