(As seen on XGH's blog as a recent comment:)
I tend to look at 'hashgacha pratis' in the sense that if Jews, as a community, adhere to the lessons in Jewish tradition then, as a community, life will be good and pleasant and so on. It's a simple case of causality.
The wiser ones who understand more of 'God's ways' will be all the more able to understand how best to accomplish their goals and their life will likewise be all the more better for it.
No guarantees though.