Jared
JWs are programmed to immediately "turn off" if they hear anything negative. There are ways to reach them, and ways NOT to reach them.
Before you go too far with your parents, I highly recommend you get and read two books, you can find them at www.freeminds.org
"Reasoning with Jehovah's Witnesses"
and
"How to Rescue your Loved One from the Watchtower"
They are filled with excellent advice on what to say and what to avoid. I know, the temptation is overwhelming to get them out NOW but it's a process and there's a right way and a not-so-good way to attempt it.
Good luck