Some people have twins or triplets or closely spaced children.
You take one out, lean over, and then get the other out. Not ideal but very doable. What does family with twins or triplets do if they are in a different carpark, or the child and parent spaces are taken up with genuine users? Do they turn round and go home
I've got 2 yo twins and a 6 yo. When they were little and couldn't walk I needed to put them in a double seater trolley direct from the car, these were always kept at the front of the store. The P&Cs were half way to the store, so I would park there, leave the kids in the car and sprint to the store, get trolley and sprint back. I didn't like leaving them in the car on their own so I didn't like parking at the back of the car park in the quiet bit as it was further. If they kept the double trolleys there, fine but they didn't. So, yes I was annoyed when people in plasterer's vans, middle aged couples who then walked into town parked there. I have no problems with disabled people or elderly people who looked like a shorter walk would help parking there.
I wouldn't like to be leaning over in my car when the kids were small to put them in as I've knackered back loads of times twisting and carrying the twins, there has been extra stress put on my back as a result and I'm not risking it again.
Now they are older, I can park at the back, still prefer the P&C spaces though. I put reins on them to get them to the shop but I need to be able to open the doors wide enough to get them in, I can't do it in 4 inches of space. I hold one twin on the rein, open door wide, gather other twin under the arms and swing them into the car. Its a high car so they cannot climb in yet.
So in summary, I can get out and about but it is a lot easier if I can use a P&C space, why cannot someone able bodied walk a little further to provide a curtesy to someone else. If I'm on my own or with DS1, we park in a normal space and walk.