By that same logic, do you believe ignorance of the law is a valid defense to a criminal charge? Laws are also written by lawyers.

No, but I do believe that if the jury doesn't find it was obviously a crime without any being told the law then it wasn't a crime. That is the text of the law isn't important until guilty is decided. (So the jury can decide degree if that is a question for the jury, otherwise the judge needs to know for sentencing but the jury doesn't care)