Halachic consequences of probable outcome

 While it is widely known that in the case of the Rebellious Son - that he is killed because it is likely he will become a murderer

There are a wide range of halachos based upon anticipated outcomes

For example Rodef a person can be killed if he is percived as a likely assailant

A robber who breaks into your house can be killed because it is assumed he will also kill

An abortion can be done if it evaluated that the embryo is a likely danger to mother's life

The police can be asked to arrest a pedophile or unlicensed driver to protect against their anticipated actions

Hatzala members are allowed to return home after saving someone because otherwise people would not join Haztala

A goy's life is saved on Shabbos to ensure the well being of Jews

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All of this goes against the medrashim which state that G-d judges according to the present not the future.