It's about harming little ones. The discussion was about God killing little ones, hence the reference.
OK, I guess I was thinking that leading a child into sin, while very bad, was different than causing the time and manner of physical death. Plus, other humans are not ours to do with as we please, so there are rules for us. God has His own rules, some of which are the same, and some of which are different. His rules are not our rules. :)
Is this like saying God can sin?