In the physical realm, "pollution" can often be a matter of concentration, and perfection doesn't really exist. Enjoy that glass of dinosaur pee you're drinking. ;'}
In the moral realm the standard (God) is perfection, of which we all fall short. But we're still called cooperate with God's Grace to grow in holiness. Deliberately, knowingly wallowing in moral filth does not help us grow in holiness.
That's a theological assesment, and probably appropriate for the forum it's posted in. My disagreements with the Archbishop and his opinions are over the political aspects of his assement of the problem and proposed solutions.