I don't know if I quite agree with that being a morale issue. But that same logic nuclear reactors are immoral because if they blow up they can cause a lot of harm.
I do agree that it is a little sketchy for human flight, but they wouldn't use it if there was a significant chance of it harming the people on board.
Evolution isn't some sentient force striving for perfection. There is a lot of retarded stuff that we have evolution to thank for. This could just be a side effect of some other trait that normally helps the fish survive. Plus, earthquakes don't happen often enough to affect evolution in the long run.