Grocery store pedestrians

Somebody has got to explain to me why people think it's safe to walk into or out of a grocery store with absolutely no regard for the cars driving in the road in front of the store. Have you seen this? People are on their phones, pushing carts, wrangling kids or whatever with their heads down or looking straight ahead with NO awareness of the 4 tons of steel moving towards them. I know cars are supposed to yield to the people around the grocery store entrance. I KNOW THAT. But why are these grocery store pedestrians so trusting of the people behind the wheel? Drivers could be distracted or in a hurry and POW....dead grocery store pedestrian. Part II of this is what happened to the courtesy wave when a car yields for you to walk in front of their car? All is required is a little eye contact and a wave and everyone is safe...and the driver of the yielding car feels good....acknowledged for their "kindness". I'm just sayin'.