write correctly tons of completely mispronounced foreign (non-English) words.

Except they're not foreign words, they're English words with foreign origins. Once a word becomes a part of the English language both its pronunciation and meaning (and even spelling) can start to diverge from its origins, without those pronunciations or meanings being 'wrong' in any meaningful way. Also since there is no standardized pronunciation guide for the English language its hard to say what pronunciations are right and wrong other than referring to common usage.