The fish's freshness, its suitability for consumption, provides it with its greatest pleasure. Why, just imagine a world in which the fish were not fresh, and were therefore… illegal!
In such a world, the fish would remain uneaten. The laughably tiny plate would not be its grave, just as cutlery would not stand sentinel as its tombstones. Shockingly, it might still languish in the free seas, there to suffer the joys that only the living must endure.
But, oh! What happy circumstance! What relief we feel as we wake from our dark reverie and realize that—yes!—the fish is dead. And fresh. (The finest trick of "food" animals.)
The overall effect is a tribute to the wonders of obedience. When one follows the rules, when one is a true citizen, only then can one be properly killed and eaten. Take heed, children!