why all the changes in doctrine' question, and she of course gave me the 'light gets brighter' BS answer. I tried reasoning with her... I've
The "light gets brighter" is always the expected response, and it is hard to refute because of its emotional appeal. Instead, try commenting that you don't mind the light getting brighter, in fact, you welcome it.
Explain that what you have an issue with is an organization that is dishonest about its past and misrepresents its history to make it look like it never made those mistakes. Jehovah is a God of truth and transparency. Jehovah doesn't approve of people who are not honest. Making a mistake isn't wrong; lying about it is.
They have a much more difficult time refuting concepts when you use JW-speak.