(?) Please elucidate. Why thumb the hammer when holstering?
Bob Wright
The open-front trigger guard could allow the mouth of a holster, or of a pocket, to be snagged/caught by the trigger, which would then move the trigger in the most dangerous direction, as the gun is pushed into the holster/pocket. Holding thumb pressure against the back of the trigger keeps that hammer safely down, until such time as the user can recognize the mistake, and re-holster.