Calling something "knucklehead" is not name calling, it is what it is. I've done more than my share of knucklehead things climbing and thankfully none of them ever resulted in any harm. No one feels worse than those involved but it doesn't diminish the fact that what happened was avoidable. In this case both climbers were complicit in the final result.
Compassion? I can't express it enough, I grieve for them and their families. Truly a very sad day for all of us.