I just had to post to say that perhaps you don't know what is going on with that family. You are assuming that they are using parenting techniques that you don't agree with. But really you don't know what is going on.

For instance you could have seen me in the chemist regularly with my DS2 - him sitting in the baby capsule screaming his head off while I waited for my prescriptions. At first glance, it would look like I wasn't comforting my child. But if you knew me you'd know that he would cry and cry for hours as he has a cows milk allergy that wasn't yet diagnosed/properly treated. Whether I held him or not, he would cry, day and night. It was just going to be a quicker trip out if I didn't get him in and out of the capsule, and it would make no difference to the crying. Plus to be honest, sometimes, I just needed a break from the noise right next to my ear.

Or maybe that Mum knows that her baby will settle the quickest if left alone. Or maybe she has a disability or medical condition which means she can't hold the baby all the time.

Please don't be so quick to judge. Rather, unless it is an extreme and obvious case, I would just assume that the other mother is doing her best in the situation and what works for her family.