If the hit is off and the wound is not lethal within the time and distance that gives the greatest odds for recovery; I now want the odds in favor of the deer that he or she might recover.
When I drop the string - deer survival is the last thing on my mind. I want the "wound" to be terminal - there is no other option at that point. If a persons setup permits it - there is NO such thing as overkill in this sport IMO.