It had nothing to do with gratitude. It was Jummy Dummy and Raygun fighting the cold war by opposing anything the Russians did. We often support those who turn on us. Do I need to list them? Our foreign policy has never been based in altruism, but immediate convienience.
And your alternative to a full scale nuclear strike would have been....? It's easy to criticize. What's your alternative?
Nobody said anything about altruism, but it's not unreasonable to assume those you aided would be favorably disposed toward you.