I do the same thing. I over think my comments and often scrap more posts that I have spent time writing than I actually submit.
I don't think it is Asperger's that causes me to do this, but I believe it is the result of living with Asperger's. In other words, someone with Asperger's may misinterpret others and have their communications misinterpretted, leading to negative feedback. I want to avoid negative feedback and will over analyze my communications and won't share what I have written unless I get comfortable enough with the communication and the expected reactions.