If you are a minority of one, the truth is the truth.
As previously noted, cultic religions are an emotional phenomena. And the intelligence quotient of emotionalism is zero. Logic, reason, reasonableness, truth, compassion - none of these are in the lexicon of a cult. So when emotional people act emotional, why be surprised?
There's not much you can do about or with your parents IMO. In order for them to acknowledge the truth of what you're saying to them, they also have to acknowledge that the pursuit of a lifetime, along with the hope it represents to them, has all been a lie. And at this point late in life, they most likely aren't going to want to have to acknowledge there's no hope - at least not the one they've put all their faith in.
And since self preservation is the most powerful drive, I doubt that even as high as you stand in their regard, it's not as high as their desire to cheat death.
My own parents are in their 80s. They've read Ray's "CofC" They've read that other one by the Swedish guy (I disremember the details), the one that proves earthquakes and such are getting more rare, not more frequent. They've seen and recognize the lies, the hypocrisy, the craze for money, the pedophilia, the bullshit. They're not going to change. The JWs supply their social support. Their self-image. Their only hope to escape death. They are unable to let it go. And so they live a life that in reality is more dedicated to avoidance of cognitive dissonance than a search for truth. And you are apparently the source of the dissonance, rubbing their nose in the truth. That HAVE TO avoid the truth. I gave up. Sad, but true.
Francois
I know a woman who STILL believes that Jim Bakker was brought down by satan's agents. Still sends money. She also believes that if the entire world was drinking a glass of Shaklee's Powdered Wombat in milk every morning that the whole world would be happy, healthy and war would be no more. She also sells Amway. And some other Ponzi stuff. It's a personality deficit.
NOTE TO GOVERNING BODY: You've been challenged to a debate, boys. Dont you have ANY balls?