There’s a difference between thinking something is true and proving that is. Besides, there’s still a lot of men who neglect their children and a lot of people both male and female who think child-rearing is the woman’s job. It’s a persistent stereotype that has a negative impact on the family dynamic and the child.
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A study doesn’t prove anything. It provides evidence. That is why you can have conflicting studies. A peer-reviewed study is a drop in the bucket of creating an actual scientific theory. It has to be consistently reproducible and actually reproduced before it has proven to be “true”. As true as anything can be scientifically proven. It’s always refining itself