Um, no. The ethical issues have nothing you do with this. They problem is bringing an animal into a world that no longer naturally supports it. So, it becomes only a lab curiosity with no ecological role. Plus, it's unknown how it would interact with the existing ecology were it to get into the wild.

It's not blood. It's a protein spot. It's more common in brown eggs because they're harder to screen with a backlight to weed out those eggs, although the spot is harmless.

Not ice - the warning was that the O rings sealing the joints between sections of the solid rocket boosters would be too stiff in the cold to seal properly and hot combustion gases could leak. That's what happened .