Here are some examples to get us started.
In all three there are good answers (those I answered these, others have great answers too) but there are a lot of "judgmental" and "Your doing it wrong" style of answers.
Parenting is complicated. Right and wrong is based in large part, on history, culture, background and previous experience. Yet a lot of the answers to these and many other questions on this site are simply "Your/they are doing it wrong and my way is the only right way!"
For example, the OP was asking for ways to make sure a lesson sticks. It doesn't matter that we agree with the lesson or not, that's not our call. While several answers are trying to help with the actual question. Many answers and comments are telling this parent that they are a bad parent and are "doing it wrong".
Again has the same pattern. The OP asked a question about turning a negative experience for a child into a learning opportunity. Several answers try to address that but many answers and comments are judging the "dad". Again, it's valid. It may not be what we would choose, to do but the "dad" in the question is 100% correct and within his rights to do exactly what he did. I don't mean that as a judgement in the other way (Good is still a judgement) I mean that as in no abuse, didn't whack the kid with a chain saw, way.
Same pattern, many people judge the mom for choosing to enforce a rule. We don't get to pick what rules are enforced or not, or what punishments are ok or not. This question is a little different because it asks if the punishment was a bit too crass, but still the parents have values they wish to pass on to their kids. We should not judge a parent for that.
How can we as a community get posters to not judge but to help out?