Yeah but how do you LEARN the ability to do that? To keep that practice always in your mental backburner, and remembering how important it is? Why, you learn it by seeing the impacts from those succumbed to negative influences they surrounded themselves with!

You can't learn the application of hand-picking your people and environments if you don't first see the outcomes when such application is neglected, and understanding its importance from there. If you have the hand-picking done for you as well, you risk not learning the ability to do it yourself. Or how to handle the situations where you can't.