Like I asked before, how do we know that people won't be screened for "bad" genes and prevented from marrying/procreating/holding a job because of the perceived flaws in their DNA?
We don't. And the Wright brothers didn't know that airplanes would be flown into building.
But these aren't good reasons to limit technological advancement.
Is anyone who brings up questions like this engaging in nothing but knee-jerk fearmongering, impeding scientific progress for no reason?
There's a difference between "Be careful." and "Don't do it.", which side are you on?
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