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Ingenuity is also basically disposable. If it has a complete failure there is no critical mission tasks that are blocked or interrupted. When the device is basically a bonus-time test with a fixed weight limit then you can take a lot more risks to pack more into that weight if you accept a reasonably high probability of failure.

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They probably also expect to learn something from the failure. If this is a more modern chip that is testing it's radiation hardening, this is a good place to put it in trial run. If it fails, they get new information, if it succeeds they now have a successful flight with it to Mars and some data.

It's a great 2 for 1 thing that NASA typically does. They'll win even when they fail because they learned something and they won't fail that way again.

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