Being afraid something is true is accepting the possibility. Accepting the possibility is the first step to believing. At least you are smart enough to question. Think of how easy it is to believe, for people who don't question, who don't even know how to question. For most people, it's not the truth that is important, it's the cause. Rahl is intelligent; he has given them a cause.

… many people must be ruled to thrive. In their selfishness and greed, they see free people as their oppressors. They wish to have a leader who will cut the taller plants so the sun will reach them. They think no plant should be allowed to grow taller than the shortest, and in that way give light to all. They would rather be provided a guiding light, regardless of the fuel, than light a candle themselves.

Fate does not seek our consent.

no army has ever marched into battle thinking that the Creator had sided with their enemy.

Wizard's Seventh Rule
Life is the future, not the past.

Bags!