Blue only appears moral because of vague wording.
The blue button only appears moral because of the deliberately vague descriptions and sanitized language in the original problem: "people will survive unless...", "if X, everyone survives...", etc.
Assign any method by which "people will not survive", and the truth is shown for what it is: the blue button is a SAW movie contraption, and the blue pushers have Stockholm syndrome for the evil puppet.
Examples:
Blue button releases a pack of hungry lions. If blue wins, we cancel the release. Red does nothing.
Blue button releases poison gas in the room if blue wins, we hand out the antidote. Red does nothing.
Blue button activates a bomb in the building. If blue wins, the bomb doesn't explode. Red does nothing.
And so on and so forth. Im every case, the red button doesn't actually do anything except refusing to participate in this twisted game.