"the parents have failed to teach the child that such tactics do not work" How many times are the children allowed to try it during the process of learning tha

"the parents have failed to teach the child that such tactics do not work" How many times are the children allowed to try it during the process of learning that it doesn't work? Or rather, how is a parent to teach their children it doesn't work after the first (and only in your unrealistic view) time? It's only a parenting fail if they continue the behavior beyond a generalized age of say 5 years old. And how can you, as a passerby determine if "this" time is a first/early attempt at manipulation or just the result of learning that it works? I've learned not to be so judgmental of other parents after becoming a parent. I hope you do too.