Fear.The Reformation resulted in the American Bill of Rights -- at the time considered one of the most anti-Catholic documents ever written.
Jury of one's peers.
Separation of church and state.
Democracy, freedom, human rights...
Human Rights -- granted directly from God, not through the Catholic church.
The Reformation was the worse thing ever, so why on earth do Catholics want to live in this horrid country that they hate?
Oh yeah - and that would be Self.
In a nutshell - they are afraid of their Self, and the honesty it embeds upon their minds.
So they stay fearful, all the while promoting more fear, but not once, ever being honest with theirself or others, perpetuating a belief built upon ego and hatred of others.