The jury knows an unrepentant obviously guilty jerk when they see one, and even the best lawyer can't help you if you are committed to showing the jury that you are an unrepentant obviously guilty jerk.
One of the tricks in life is to be able to identify what you don't actually know, and then recognize that being agnostic on the topic is the way to go.
If you speak with certainty about things that you actually don't know about, I can file that into my records on how to judge your posts