@rok0 If I ever have kids, I would only take them to grocery stores that don't sell toys or any other kid stuff so they won't start screaming if they see something they can't have. This won't guarantee that they won't start fits, but it helps.
I also heard about parents getting kicked out of stores because their kids are too loud. I guess that might be another reason why they leave their kids in cars. It's still not an excuse though.
Every child deserve parents but not every person deserves to be a parent.