Even the us army studied the stories and decided the issue was marksmanship degradation under stress and not the rifle itself.
It's not so much the rifle, as it is the .30 Carbine cartridge that's to blame for the M1 Carbine's reported lack of stopping power. Although, there were reports of problems with the carbines jamming in extremely cold weather (partly as a result of weak return springs and inadequate cartridge recoil impulse due to the subzero temperatures.)
I also don't put any faith in a report that blames a soldier's aim with a particular rifle for it's lack of stopping power, when I'm not aware of any similar failures with the Garand or Thompson. Especially when the soldiers reported delivering multiple torso hits with the M1 Carbine and they failed to incapacitate their enemy.
McManus, p. 52, "Richard Lovett, of the U.S. Americal Division (Pacific Theater), was one of several who did not like the carbine. "It didn't have stopping power. Enemy soldiers were shot many times but kept on coming."
There were numerous after action reports from U.S. paratroopers (dating from 1943 until the fall/winter of 1944) that stated that the .30 Carbine lacked sufficient stopping power. Those guys were highly trained and crack shots. For an army report to suggest that they experienced "marksmanship degradation under stress" is an extreme insult to them. Even if that report was commissioned during the Korean War, the observations of front-line combat soldiers from WW II were still relevant.
There used to be a video on YouTube of Don Burgett stating that anyone he hit in the torso with a .30 cal (from his M1 Garand) went down and stayed down. He didn't like the M1 Carbine's stopping power and neither did a multitude of others that actually used them in combat.
For it's intended role as a close-range support weapon, the M1 Carbine might have been adequate. Some troops loved them for clearing buildings and jungle fighting.
It was supposedly popular in Korea for night patrols (as we can see with Private Matthews of the RCR.) It would have been a lot lighter than a Thompson and a lot more maneuverable than a Garand.
I've never shot one, but I have held several and inspected them closely. I can't attest to their performance, but I certainly give precedence to the observations and experiences of soldiers that saw how they performed in actual combat over anyone else that hasn't.
For that reason, I'd pass on one if it's purpose was to defend my life and I had a better option available. I just hope that Private Matthew's M1 Carbine served him well and he made it home safe and sound.
The Korean War wasn't mentioned much when I was young and I can't recall ever meeting a veteran of it.
Those Canadian soldiers that served there deserve to be remembered and respected. Just like in every other war.
Then as now, they deserve(d) the best that we can give them to get the job done and make it home alive.