Suspicion with lack of data allows you to fill in the details later. Lack of easy to obtain information means you are not low hanging fruit, you require effort and resources.

You run the risk of being in a location at a certain time which you can't dispute.

If you decided to murder someone your cell will identify you. If you decide to leave your cell at home you will look guilty. If you always leave it at home you are good to go.

It's safer to be the ghost in the wires. It's safer to be the bug in the app.