1. A writer knows that what is true for him or her is true for most people. The more honestly and clearly the writer tells his truth, the more that other people will recognize it in themselves.
2. The writer also knows that no matter how universally true a thing is for him or her, there will be some who find it utterly and thus aggravatingly false for them. And the more honestly and clearly the writer says a thing, the more violent will be the objection.
There are a lot of perfectly competent sentence-makers who lack confidence in number one above, and also courage for number two.
(Me, some days!)