SueDonim
Guilty as charged. It’s not something I did with my own children but I have done with my grandchildren. I am no longer physically able to lift an 18kilo toddler high enough up to get into the actual seat, let alone hoick him up to get him out again. Also being on the 97th centile for height and weight, he’s such a big lad he doesn’t fit in.
I can’t lift him into his car seat, either, he has to climb in himself.
I suppose I could let him charge around the supermarket tripping up people and taking bites out of apples and loaves of bread etc but I expect someone would moan about that, too. 
Yes, I think you should let him run round, bashing into people, nicking food, spreading dog poo from his shoes, spitting in the fresh food aisles whilst singing “old macdonald had a farm” at the very top of his voice 
At least people would then have something real to moan about.