It's not that he knows something that we don't!!
He is not your average 27yr prisoner.
He is well educated, literate, intelligent, strong, focused and believable (to some).
This is neither the mindset or the demeanour of one incarcerated for so long.
Should he ever be able to tell his story, to even delve deeper, then who knows what he may find and who he may destroy in the process.
Jeremy is too high a risk.