He had, of course, a point. It's easy to see only the dirty hands, but one must also remember the precious jewel. That is, at least, half of his point:
The other half of the point, of course, is that we must not so romanticize the jewel that we fail to see the dirt on the hands, and the fact that the dirty hands are also, at times, our own.
Only Christianity avoids these two dangers -- (1) the danger of an idealism that so romanticizes the aspirations of human nature that it loses sight of our aberrations, and (2) the danger of a realism that is honest about the aberrations of human nature, but at the cost of denying our aspirations.
We have two core doctrines that speak to both sides of this dilemma -- (a) the doctrine of creation, which tells us that we were made in the image and likeness of God, for glory and greatness, and (b) the doctrine of original sin, which tells us that we have fallen, through our own grievous fault, into Gollum-like selfishness, smallness, malice, cruelty and sin. Only a religion that does justice to both our aspirations and our aberrations can be true. The Church, a precious jewel passed from one dirty hand to another down through the years.
Related: Thomas E. Woods, How the Catholic Church Built Western Civilization(Regnery, rpt., 20012).