An important distinction you are making there. We don’t understand them because we are not allowed to even examine their religion in context to this war on terror.
It isn't just a language difference....our meaning and that of the Islam is so very different...and they do not help the situation by letting us “believe” we are speaking with the same meaning.
They will agree that the world needs ‘Peace’....and use it often....but to them, and in their minds, ‘Peace is ONLY thru Islam’. So you see when they are using the term Peace it's quite another thing then how we see Peace. Yet they never reveal this in the course of conversation.