Koshogi, the reason St Johns (or any other first aid course) does not teach/recommend tourniquets is that there is a little more involved to it than just shutting off bloodflow to the affected limb...
Most first-aiders would do more harm than good by applying a tourniquet. For the general public direct pressure and elevation is a much safer technique to teach.
In all the time I was an army medic and then a volunteer paramedic in civie life I never once got a pt that required a tourniquet. This included serious gunshot and stab wounds, vehicle accidents involving compound femur fractures, degloving injuries etc.
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