The first thing I would address, and have no clue how to go about it, is the denial the str8 spouses have in the beginning, and how that continues for a long period. Specifically, I'd love if you found a way to reach these spouses before they waste any more time. I know that I didn't listen to anyone regardless of how many stories I read/heard or what outsiders said. I wish somebody would have beat me in the head and made me listen to these stories, and drill in my head that my outcome would be the same, bc most are. Sadly, I think most people think this way and don't listen until the pain becomes unbearable - I wish we could reach ppl before they endure that.
You could also add how the LGBTQ community and your deceitful spouse are incomparable issues. Some spouses question whether they actually support gay rights bc they're uncomfortable allowing their spouse to have outside gay-relationships, or in my case I wrongly blamed the LGBTQ community. These are 2 completely separate things that can't be compared. But you could also note that it is important to support LGBTQ rights bc had they never been shamed, many of the gay spouses may never have married and caused this pain to their str8 spouses. Many did not mean to hurt their spouses, they married bc they desperately wanted to be what society deemed "normal." However, if LGBTQ were normal and more accepted, especially in fundamental religious organizations people wouldn't be shamed and feel obligated to hide. I'm not excusing their behavior as they didn't have to marry, or lie and manipulate, but it's a step in a better direction to prevent this.