Not to trivialize this, but when I was about 14, I learned about sales and where not to go, we had a store in Vancouver (Woodwards) that would throw super specials on and the mob that would come through that door was ferocious, the employees would throw open the doors and stand aside while the herd went through and god help you if you were in the way, it was mostly little old ladies, grandmothers, but if you were in the way, it was cane on the toes, elbow in the ribs, kick in the back of the heel, point of the umbrella in the knee cap, I was at the time shocked and horrified, I didn't believe that grannies were that savage, 14 you know and like all 14 year olds a fool, I got caught twice, never again, so this is not a new thing, just carried forward too much and if it's been like this for a least 50 years + mart of the wall must have know of the possibility and should take some responsibility.
Bill the demon.