I usually park at the back of the lot, and walk. Will drop SWMBO at the door if requested, or if the weather is nasty. In nasty weather, will offer to pick SWMBO at the door, but she usually will walk with me on the return.
I always remember dropping by a Walmart near where my wife used to work, on a weekday afternoon. Walking from the back of the lot, I'm hearing squawking..... turns out this 350# lady is yelling at this 425# lady because she took "her" spot - middle of the lot, nowhere near the handicapped spots. There were at least 800 other spots open.
Like many on here, I'm not a "city" guy..... a lot of this thread comes down to is something I noticed a long time ago - Overcrowding Produces Deviant Behaviour in Animals - it is true throughout biology. As has been commented, most dogs behave better.
It is a significant problem in Canada too; the actions described in USA locations mirror most of our cities here.
In the interests of managing my blood pressure, I deliberately don't spend much time thinking about the decline in civility in the general population. An occasional debate like this reminds me of why I value my close friends so much.
Staying away from Walmart (except in way off-peak times), and ordering online are two approaches I use.
Yeah, some days I get twicked off watching what passes for civilization, but I try to remember to Ignore the Small Stuff....
Rgds, D.