What You Can't Say (2004)
Here are some things I think future societies will condemn us for:1. Prison. Almost every modern penal system focuses on punishment rather than rehabilitation. I think that as our understanding of the brain improves, we'll be able to find the causes of violent behavior and cure them. Punishment will become cruel and unusual.2. Eating meat (and other animal rights issues). Even if they're not conscious, most tasty animals can suffer just as much as we can. They have desires and kin. Some even mourn the passing of their brethren. But few eyes are batted when our microencephalized cousins are abused and killed by the billions. Cheap in-vitro meat is probably a prerequisite for this change.3. Banning assisted suicide for the elderly and terminally ill. See http://slatestarcodex.com/2013/07/17/who-by-very-slow-decay/I doubt I'll be right on all of these, but I'm hopeful. 
Now for something I really can't say: I think all three of these atrocities share a root cause. Some of you will probably guess what I'm getting at.