However I've always seen it as a metaphor for not judging people you barely know. "Don't judge a man until you've walked a mile in his shoes" as the saying goes. A person's situation is unique to them and is the basis for their behaviour, so if you don't know why they're behaving the way they are, don't criticize.
Those people of ISIL in Syria and Iraq? We don't truly know exactly why they're doing what they're doing. We can make educated guesses based on the actions we've seen and the videos they post online that show us the posturing and the executions. But we can't get into their heads. What's clear is that they hate us for their own reasons.
Those strong words are what the world needs to hear. Hating someone only eats away at you and causes more suffering. Acts of evil must be met and countered, but using anger and hatred to do so does nobody any good in the long run.