Hello!
Good luck trying to get them to think.
1914 is significant based on 607 BCE. What historical evidence confirms Babylon's destruction of Jerusalem in 607? None. It happened in 586/7. Russell got it wrong over 100 years ago and JWs are still getting it wrong. If it's such a big deal that Christmas shouldn't be celebrated because the encyclopedia says that Jesus wasn't born in December, 1914 also needs to be tossed out because the encyclopedia says that Jerusalem was not destroyed in 607. As JWs used to use the illustration, you wouldn't drink the water even if there was just a little bit of poison in it. 1914/607 is some of that poison.
That's what gave Carl O Jonsson the initiative to investigate and also what motivated his conscience to take a stand away from the WT's flawed and erroneous view regarding their so called selection.