Allow me to clarify:

Hatchery fish derived from out-of-basin stock, should be removed from the system. That is one of the goals of fish managers because it is good for wild fish.

Catch a dark hatchery fish? Bonk it and tag it if you have not yet reached your limit. Or pass the rod off to your buddy and let him tag it. Releasing it to spawn is pointless.

Scenario one: If it spawns with another of its kind, no returning adults will result from the pairing... an utter waste of the limited spawning and rearing habitat occupied by the maladapted hatchery fish that could otherwise have been used by native wild spawners and their progeny.

Scenario two: If it spawns with a wild fish, exceedingly few returning adults will be produced by the pairing (statistically indistinguishable from ZERO) thereby wasting the full reproductive potential of that wild fish. You may just as well have bonked the wild fish to get the same result.

Moral of the story:

Whenever possible, bonk the hatchery fish that you legally catch with hook and line. Tag it as required by law. If it is not fit to eat, instead of throwing it in the trash or burying it in the garden, consider returning it to the river from whence it came... more food for the wild juveniles.

Hardly a case of wanton waste.