Sacred cows make the tastiest hamburger. It is not the answer that enlightens, but the question. Intellectual liberty is the air of the soul, the sunshine of the mind and without it, the world is a prison, the Universe is a dungeon. I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it. New opinions are always suspected, and usually opposed, without any other reason but because they are not common.
Thought takes man out of servitude, into freedom.
Freedom is always and exclusively freedom for the one who thinks differently. Opinions cannot survive if one has no chance to fight for them. None but ourselves can free our minds. Many times our rules are located in another time, another culture and the child has the right to challenge them, since they chose to be born on this earth. So the child has an opportunity to be curious, and they have to discover for themselves.