I have 3 kids all 2 and under. I had my DD on a leash today. I have no problem using the term leash, but it was, technically, a backpack harness. I held her hand, but had the leash part wrapped around my wrist just in case.
We were all walking around downtown with typical city traffic. I had my 2 younger ones in my double stroller.
I'll be blunt....unless you have 3 kids all under 2, you have no right to judge how a parent manages alone. You haven't been the parent struggling to carry a huge diaper bag (my diaper bag weighs 16lbs because I have 3 in diapers), push a double stroller one-handed, and praying to God your just-turned-2-yr-old doesn't dart off after that really cool truck she just saw and yelled "TRUCK!" with a giddy smile on her face, amazed with all of the
moving cars (we live in the country and this was her first trip to the big city).
I would never drag her, obviously. I also wouldn't drag her without the leash - dragging is never a viable option.
But, unless you've BTDT, you can't judge. I guess you can shoot me a dirty look as you stand there either childless or with your 1 child or with your 2 children, or with your kids who are older or have more of an age spacing, etc. But, unless you've had a 2yr old, a 14mo old, and a 2mo old, a 16lb diaper bag, and had to cross busy city streets all by yourself, you can keep the judging to yourself.
There's that old saying....I was a great parent, until I had kids. I was also set in certain ways when I had my ONE child. Views change drastically when you're juggling 3 kids 2 and under and you're on your own in the city with cars flying by.
It also results in a massive migraine, but that's another issue!