Legitimate -
1. according to law; lawful: the property's legitimate owner.
2. in accordance with established rules, principles, or standards.
3. born in wedlock or of legally married parents: legitimate children.
4. in accordance with the laws of reasoning; logically inferable; logical: a legitimate conclusion.
5. resting on or ruling by the principle of hereditary right: a legitimate sovereign.
6. not spurious or unjustified; genuine: It was a legitimate complaint.
I would say #6 fits my usage. I see no corruption requirement. Everyone perceives words differently, so I don't know what it implies to you, but to me it is what it is, an unjustified result. A poor strikezone call is outside the rules, and a player's "bad day at the office" should decide a competition on the field of play, not the person administering the rules.