Freedom of expression, whether or not it hurts anyone's feelings, is the root of all other freedoms and all progress.
Take that freedom away, you get stagnation and all of the abuses of an orthodoxy.
People who are secure in their beliefs may not like those beliefs being criticized, but they don't feel the need to try silence people. As far as they concerned, they know what they know and that critic, pity them, is simply wrong.
In reading the scriptures, there are two kinds of mistakes:
One mistake is to cling to the literal text and miss the inner principles.
The second mistake is to recognize the principles but not apply them to your own mind, so that you waste time and just make them into causes of entanglement.