The use of WC ammo for defense is not new, just rehashed. In 1969 using wadcutters was espoused by some gurus for SD & LE. Some touted using HB wadcutters seated backwards, I saw something like that advertised recently like it was a new cure for cancer. I still use the 158 gr SWC HP +P as it is what I was "raised on". Used it, still works.
The "Chicago Load" or the "FBI Load" was the issue round for most of the time I spent with Chicago PD (1965-1995). The +P round was required for steel medium framed revolvers, and the non +P round for small frame and alloy framed revolvers. For a short time the same round in non HP configuration was issued. I use the "Nyclad" version of HP or SCW, like it a lot. For 9mm Super Vel was the way to go, similar 9mm rounds still are IMHO. The Super Vel was a 90 or 110 gr copper jacked HP which really moved out, 1200 actual fps, IIRC. Made quite a flash also. Of course the semi auto handguns of the day were a little problematical. The Model 39 came out with the Illinois State Police in 1967, replaced by the Model 59 a few years later. I felt the Browning HP was the best 9mm back then, still do. Super Vel also produced some real fire breathing 38/357 rounds, quite literally fire breathing. Same formula, lightweight JHP moving out at serious velocity
Chicago cops carried 6 rounds in the gun and 6 in a dump pouch (the operative word is "dump"), For a while some bosses enforced the "only 12 rounds rule" strictly. The ISP were authorized to carry only one spare magazine in a pouch on the cross draw holster, and they enforced that rule very strictly for a time. That changed when a trooper saved his and several other lives because he had a "bootleg" extra magazine with him and the fight exceeded the capacity of his M39 and extra magazine. He got a medal and a written reprimand at the same time, then they changed the rule. I just carried an extra dump pouch which could be slipped off and pocketed when the Inspector was around.
Don't remember who said it, but: "Bullet placement is King, penetration is Queen, everything else is angels dancing on the head of a pin".
I believe it.
I have seen a lot of folks shot with small calibers fall over dead, and many shot several times with the biggest and heaviest loads keep on being seriously anti social. For a while. Sometimes, quite a while.
There are so many variables, particularly these days with so much drug use, and so many crazy folks around, including some very high ardrenalin. I believe those factors do affect how people respond to getting shot.
I am starting to think that ones' social agenda may produce some very high chemical responses, of course I could be wrong. I was wrong once, but then I realized I was mistaken.
I am an old guy, I get to ramble...