If your values are criticized ,
sometimes we need agree "to disagree". Remember: your success in persuading others assumes that the other person is open to being persuaded!
Fear: If you are not used to communicating,
especially in writing, you may need to overcome fear on several levels. Writing, unlike unrecorded speech, is a permanent record for all to see, and the "context" is not as important as in speech where context "colors" the words. For example: your readers do not see you, only your words. They do not know what you look like, where you live, who you are.
Persuasion also has another dimension:
it is built with facts, which illustrate conclusions. Of course, this means you need to know what you are talking about, and cannot be lazy with your facts, or you will not succeed in convincing anyone. This shows another level of fear: Fear of making a mistake that will make your argument or persuasion meaningless. Since you are writing, and the words are on paper for all to see (or on a web site!), you need to work to make sure your facts are in order.