I also don't buy the "we musn't judge" line. It gets trotted out a lot on here. "Judgey pants" blah blah. Yep, sorry, everyone judges. Sometimes it's useful and it's also part of humanity and civilised society. You can still empathise obviously, but doesn't make it OK just because you empathise.
However, wasn't part of the problem with this case, judgements and prejudice against people who live chaotic lives? Because their house was immaculate and they spoke well and she was quite pretty, they didn't think anything was going on.
So not a black and white thing I don't think.
I 100% judge anyone who was physically restraining a small child though and making him stand outside all the time they were having a hair appointment. I think that couple (hairdresser and partner) did judge but didn't say anything in case they got called judgey.