There is a difference between kids using bad behavior to get attention or blackmail parents vs kids who have actual behavioral problems they are working through.
The first is an actual problem stemming from bad parenting and as a society we should indeed shame parents who raise spoiled kids who expect everything to be given to them.
The point is that if you just see a kid on the street throwing a tantrum, you don't know which of those situations you're actually looking at
OP was referring to observations at friend's houses. Presumably they'd be aware of any underlying issues.
Judging random people on the street isn't wise. Judge your friends and loved ones instead! :D
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I mean, do you even know the full story at a friend's house? I guess it depends on how closely you know them, and whether they've confided any developmental issues they're children are dealing with.