I would think that safety would be the number one concern. Not sure what the terminology is but, the half cocked or safety cocked position would seem safer to me, just my thoughts.
I could be wrong, and no, it is not about the children, it's about not having an accidental discharge.
There is a manual safety that (as designed) prevents the trigger from being pulled and thereby prevents the hammer from falling. It is generall on the left side of the gun, so it is not seen in a picture showing only the right side. With a hammer down on a loaded chamber, in all 1911s, you would have to pull the trigger an manually lower the hammer. This is not m favorite activity as accidents happen. In some 1911s, a blow to the back of the gun on the hammer with the hammer down can drive the firing pin forward, firing the gun.
With the hammer cocked and the manual (thumb safety) engaged, a 1911 is at its safest while ready for action.
The half-cock is there to catch the hammer and keep it from hitting the firing pin if it slips while you are manually cocking the hammer.