Perfect Cell not killing everyone, even if capable, is not a reason to owe him anything, what the fuck?

By that logic, everyone on Earth owes everyone on Earth a favor because everyone on Earth is theoretically capable of killing any other person.

Giving Perfect Cell a Senzu bean directly lead to Cell evolving further.

Goku trusting Gohan is not a valid reason to endanger everyone on the planet.

Goku is reckless and thoughtless, and regularly puts everyone else at risk.