He is a date raper in the same way that Ted Bundy was.
Human, I tend to agree.
But bear in mind right now, what is in it for JM to help LE in this case? Forget the "doing the right thing" with him, that was gone a long time ago. If he did kill Hannah, and knows where the body is, it's not like he's going to get the reward, a pat on the back, and released, be the hero. Nope. He'll be up for the death penalty. He'll be thrown into a tough prison, probably get abused there. Family will have the legacy of a confessed rapist/murderer. Seriously, what's the up side for him?
If he keeps his mouth shut. If LE doesn't find Hannah. If there is no more DNA in that car to prove she was in there, what kind of case does the state have? His attorney is saying very little. He's going to make the statements based on the evidence LE gets and has to share with him during discovery. He could walk. And depending on the DNA link and evidence in the MH case, who knows what kind of case that will be in court? As for the Fairfax rape, if the victim won't come back, I have no idea what will happen there.
So what benefit is it to JM to cooperate at this point in time?