How do you decide between those who need (actual) intervention and those who don't?

Because the state assumes everybody needs intervention. How does nature solve the problem?

Is nature cruel?

The closer you are to a person that needs intervention (e .g. children) the better the intervention can potentially be (unfortunately it can also be worse).

In the end a free society would give back autonomy to those who they think need intervention offering a helping hand while distancing from abuse.