The .30 Carbine Cartridge - Why?

This is a discussion video in which we address the following questions from Patreon supporter Alex V:

"I was wondering if you could address the choice by the US Army of the M1 Carbine in .30 Carbine, over a full-auto weapon like the Thompson or the grease gun, and in a new and otherwise un-used cartridge, instead of something already in production and in the supply chain.

What practical real world benefit would the .30 Carbine round offer that would offset the nightmare of getting yet another item to troops in all theaters of the war?

Why go to a semi-auto carbine, when the Russians and Germans were proving the effectiveness of full auto SMGs that could also be fired single shot from the shoulder?

While the M1 Carbine is a handy little rifle, it seems like there would have been better options available to the Americans when it was adopted."

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Видео The .30 Carbine Cartridge - Why? канала InRangeTV