As I wrote to some friends of mine ...
Francis is showing here that, as his critics charge, he fails to take into account the sinfulness of "remarriage", nor does he even begin to address the harm that divorce and remarriage does to innocent children. He's on Kasper's side in this argument, there's no question.
"I was not defeated by sin, I need to move on," is a wonderful component of repentance. But to continue to live with and take to bed a person who is not your spouse (as those divorced and "remarried" Catholics do) is not "moving on" "undefeated" by sin.
Francis fails to address this, and this shows us that his critics are actually on to something.