Don’t think of it that you are holding yourself back. You are merely deciding against posting and broadcasting a certain idea. There are many topics of which I had strong opinions, that I decided not to contribute, for any number of reasons. I’m not in middle of a discussion, where not answering is an answer of its own.
This is a message board. It is a place where people drop by and post a message, usually pertinent to the topic, and others read them and sometimes post another message.