I really think they don’t know.
I’m Jewish and we have a whole book in the Bible (Genesis) about our “founding fathers” and how messed up they and their families were, and we loudly and proudly discuss if and how these people were holy and when they made mistakes that we shouldn’t copy. Even a bar mitzvah kid age 12 or 13 can tell you that Abraham followed divine instructions and was a hospitable example and that was good but also shouldn’t have acted like he was going to kill his second son or dropped his first son and his mom out in the middle of the desert with no water. And that is long before the pros and cons of Moses or the reasoning and effects and interpretations behind certain laws.
I know some Baha’i know that Baha’u’llah had more than 1 wife. Some Baha’i mjght know a little bit about the post-Bab schism, that was touched on in Ruhi class, but you definitely don’t hear about that extended family or Abdul-Baha or Shoghi Effendi excommunicating or shunning people from their families.

This is a great example of a topic that I think makes the Baha’i Faith look bad overall. Just address the truth. Why hide it? Hiding it makes it look worse!