I don't go to malls, theaters or school. So my revolver is still good enough. San Bernadino shooting was two home trained terrorists, same as two perps. I think we need to rethink COM and aim for the pelvis. A good pelvic shot is as good as COM and you know there's no body armor there.
I would challenge you to re-think that. The pelvis is shaped like a plate. Ever walk on a metal plate full of holes to make it lighter? Still holds your weight. A fat, slow, handgun bullet is likely just to make a hole through the pelvis, not fracture it (this is according to an ER doc's experience, wish I still had the source link). Not to mention, most people don't even know where to aim. Even if you hit the pelvis, and if they drop, they are still an armed threat that you have to deal with.
COM isn't where you should aim either (pet peeve, everyone says "COM"). You should be aiming center chest which would be the center of the sternum where the heart is (slightly offset to the left, but a center sternum hit, hits the heart). A good reference area would be to draw a line between the nipples and make a triangle with the point at the base of the throat.
Center of Mass of the torso from the belt to the throat would be a little lower than the solar plexus area below the heart. Great place to aim as a soldier at typical combat ranges to help assure a hit...somewhere. Poor place to aim at the average domestic gunfight distance of 21ft and under.
If a few rounds center chest don't do it, switch to the head, specifically the mid-brain/brain stem area. Aim point is roughly the triangle made from the eyes down to a point at the top of the upper lip.
Training for a maybe hip-shot that doesn't even end the threat just because in .00000001% of the time they may have armor on doesn't make sense to me. If you see the armor, go for the head. Not to mention, taking rounds in armor is brutal, knocks the wind out and routinely breaks ribs etc. Impacting their chest with armor can still give you the 1 second transition time you need to make the head shot before they can recover from the impacts.