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I don't think you can start this charm offensive after the crime, though. The only person I've ever seen manage that is Rob Blagojevich.
As has been said, the value of standing under a huge tree is more the shade, not the fruit. Your rich friends may never do anything for you, they might only value your friendship because you're one of the few who have never asked them for anything. But, consistent with that, if somebody attacks you they'll defend you as hard as they defend their other possessions. That kind of armor enables you to pluck fruit from other trees.