What's really quite remarkable is that you managed to provide quite clear illustrations of argumentum ad ignorantiam in such a short post!!!
While in many places it was illegal to teach blacks to read, this was overlooked when the topic was Bible verses. Unlawful assembly was a violation that had nothing to do with the Bible. You also ignore the facts that Jackson admitted the classes violated the law, and the local resident who threatened him apologized immediately after.
You seem to be reading things with a strong bias, making you see things that aren't even on the page.
The post was in reply to the claim that Jackson taught the slaves to read. If you've read the book then even you know that the claim was wrong.