You only prove how great Magikarp is. They would sacrifice themselves without hesitation to save even the utterly worthless scum that refuse to acknowledge their Serperior, their God. Hell, the Almighty 'Karp already sacrificed itself once for all'a your damnable sins. He'd even do it again for that stupid fish you love so.
Death fodder? No. Martyrdom. Out of love for those who clearly do not deserve such selfless benevolence.