Good post flags, I agree. If you're hunting YOUR LAND his philosophy might hold true. Letting smaller bucks go so that they can grow will work if you don't have to worry about somebody else shooting them, like on Public Land where it's usually the first legal buck that get's shot. Reality is reality.
I hunt State Land where it's bowhunting only, so I do actually let smaller "legal" bucks walk. In fact, I let this little guy go at 10yrds on Halloween, as he proceeded to walk right in front of my trail cam! I don't have control over what others shoot, but I have control over what I shoot.
If it's legal, shoot what makes YOU happy!