The Punisher has always been an extended issue of Marvel's "What If", crossing into D.C. territory.
The Punisher is "What If Batman had a Gun?", basically. He is supposed to be, and is at his very best as a character, when he is portrayed as a broken shell consumed with both rage and sorrow, from whence everything human is slowly draining away, or being consumed by his rage... including his sorrow. He is meant to be seen as an empty man - a machine still going, long after it has served its purpose, and lost all human function. He got his revenge IN HIS ORIGINAL MINI SERIES, for crying out loud. He's a broken record of the cycle of revenge. He's his own Old Yeller.