Probably said already but you did not save anything, at least not according to the game. Had you saved anything, the game would have rewarded you for the save instead of just giving you the bounty reward.
I don't think I've encountered an instance in a mission or other where saving another ship was required to gain Cr. Maybe in a CZ, not sure.
If they kept a ledger on saves vs kills of innocents, I'd probably be in the red. I've killed thousands of tourists ships. Game doesn't care about good or bad, only about the law. If the system isn't anarchy, you're going to incur a fine for shooting a ship that isn't wanted. You might even follow a ship from an anarchy system that had just killed thousands of tourists, and then kill it in a civilized system, and you'll be the criminal. Legality, not ethics.