On occasion when I do see something true in what people like McLaren said, when I am obedient I use it to take stock in my own life and if I am found wanting. I see it as God's way of showing me something about myself that needs cleaning up.
But that does not mean that I use the methods of the person, to clean it up. If I did, I would only be adding to the problem.
Back in the OT days God used even evil people as a rod of correction for the nation of Israel. Even today, God can and does use methods like that.

Tom