I think you mistake my reason for stating you do not need to argue over it. It is not about avoiding strife. It is about avoiding unnecessary requests and arguments over the request, when you have the power to do the action anyway. It is about not being passive, and instead taking control over the situation and finding out the truth for yourself. So, instead of wasting time arguing with the mother of the child about getting a DNA test, you just take the child and get the DNA test.
So simply put, it is about a man commiting an action, instead of arguing to get the woman to give permission for him to commit the action. One is far more efficient, simple, and no hassle to do than the other. Last, women fuss a lot about things. It is only an argument if you engage.