What I have learned from your links is 1) make sure your carry gun is drop safe 2) leave your finger off the trigger until ready to fire 3) don't show off to your friends
All of which should really be common sense in the first place.
I would think that any carry method would be dangerous if you failed to follow basic rules like these.
Also, technically, it's an inside the waistband belly carry which points a gun at your femoral artery (and genitalia, if you're of the male persuasion). Pocket carry points down the outer leg side for the most part.
I'm a fan of purse carry in clothing that's not CCW friendly, and jacket-pocket carry when it's cooler out. (PS purse carry implies a dedicated pouch for the gun, not buried under the 23652362 things that lurk in the main compartment).