The problem is that humans are not trying to answer one question like a Bayesian filter, even if they think they only are right now. Every assumption in your post, if it is believed, is remembered for a long time and can be combined with other knowledge to form nearly an infinite number of new associations and opinions. When you play with facts to make a point in a tone that suggests what you write is true, you poison those associations and conclusions and increase the chance that somebody will. Elieve the wrong thing.

Also, while it is true you will give up some brevity while you practice accuracy, eventually you will learn to write better and either shorten your posts again or present them in a more compelling way so that your readers do not notice the length much.