That said its a very far leap to assume (either as the suspect or as a third party) that because this suspect has a lot of online sympathy that that will translate to a jury both willing and knowledgeable enough to nullify. Certainly wouldn't bet my life or freedom on that myself.

Personally I lean toward doubting that getting caught was part of some master plan. People have this binary view of things where he's either got to be a criminal mastermind who thought of everything or a complete fool, and the reality is probably that he's a better than average premeditated murderer (given all of what is stacked against him) who still got caught due to a combination of bad luck and being a little bit careless. Considering how extensive the current surveillance state is he got closer to getting away with it than the vast majority of people would have, but also combined that with some stupid but perfectly naturally human oversights.