See the last panel:
“…there shall be weeping and gnashing of teeth.”
If Calvin’s father found Calvin hurt, or worse, would he still feel like doing the second one of those contrasting things he mentioned, especially if he found Calvin in that condition? Tragically, things like that happen these days, and with more and more frequency it seems, unless it’s just getting publicized more. Flippant remarks sometimes need to be regretted, later.