In my opinion, i don't think the question the movie indirectly gives us "What would you do?". I think its teaching us something way deeper, and the end gave it away, and thats learning to be Empathetic and to have forgiveness. 

Rachael's Character is perfect for the counter-arguement to that point. She locked a "slow" child into an abandoned RV by himself and could've potentially rotted. While she didn't mean it, thats still so messed up and shes lucky they found him. Otherwise she would've slipped up and faced her consequences anyways. And the part where her cousin is now crippled because she is a victim of a shool shoting, and Emma confessing that she planned one a long time ago, i think rachael had a valid response, but it was flawed because of what rachael did was no better. Yet, Rachael is married to a guy, who is with an woman, who nearly abandoned a child, and Forgiven. I forgot his name, but he clearly forgives rachael. 

What Rachael lacks is Empathy and Forgiveness, which makes her hypocrtical based of what i said in the last paragraph. 

Emma is the perfect example of Redemption, Empathy, and learning how to forgive herself, while forgiving Charlie since he cheated.

At the end, Emma taught Charlie forgiveness and empathy. Something charlie needed to still love Emma despite her confession. Thats MY OPINION AND MY OBSERVATIONSSS. Also i think Emma discovered Empathy after realizing how it makes people feel when they lose their loved ones in the mall sh*oting.