If you have the handicapped placard, it is supposed to be removed when driving. My mother has one and while it may appear that she is “OK” she is recovering from a hip replacement. If we are in a new place or a place where she knows the distance/terrain might be difficult we will use the placard so she can move around without much assistance. I am not as quick to judge the handicapped placard people as I used to be.
The rest of your comments though are things that make me crazy. The worst is the full cart in the “12 items or less lane.”
I believe that varies by state. Some states require that you keep them in your front window.
There is a lot of absue of handicap placards. I know two people who abuse them. One parks right in front of her gym and the other goes swing dancing 2 or 3 nights a week.
I was amazed one day when I was at Costco buying bottled water. I couldn't lift the cartons so I was opening the boxes and putting them in the trunk a gallon at a time. A woman kindly offered her help. She could easily lift the cartons and lifted three of them. Amazing.
I asked her how she could do that and she replied, "I lay carpeting for a living and have to lift big rolls of carpet all the time." She then walked to her car which had a placard and was parked in a handicap spot.
If you want to see a lot of abuse just go to Lowes or Home Depot. It seems as if all the illegal construction workers have handicap placards.