I would say that it is self-centeredness.
As long as any of us are focused on ourselves rather than God, we will stumble and harden our hearts in avoiding the inconvenient truths.
To me, pretty much everything else on that list results from closing ourselves off to really trying our best to find our way to God. Our culture unfortunately encourages us to think first of ourselves and what is “good” for us as individuals–“watch out for number one!”
I would say a close second would be the Church’s own tendency at times of forgetting its real mission of bringing people to God and instead getting into the “business” of crowd control. I expressed it in one of the threads on contemplation as being the tendency to teach us how to adapt to the noise of the world rather than how to quiet ourselves to listen for the still, small voice.
To me the secret is in positively modeling how to put ourselves in the presence of God. Once we do that, all other good things will follow.