Gotta chime in here, through a recent text message, I also asked my W to check out the book, give it a chance, and read it with an open mind and heart, She also is completely against any kind of C, My kids told me that she took them to the library this past week, and as far I as I know she didn't pick it up, or even look for it. Well, whatever I tried.
When this is all said and done, I know that, I am/have done everything in my power to save the M, I also think the book is better for one person to read at a time, but one has to understand what the book is about, it is about making yourself a better person, so if you can, save a M, If one is not wanting to change themselves and the M, then there is nothing in the book that is going to change their mind. In the end, it is a matter of choice.
As far as your question about the 180 and going dark, I think that if your spouse did read the book, they would if they had an open mind and heart, think that this is the lengths that my W/H will go to save the M, and at least respect, maybe even admire it.