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I agree that organ transplants are a net positive, and in fact are far less susceptible to unintended consequences (there's a pretty low limit to the number of organs and operations involved, for one.)

I also think that gene repair is a net positive. I would just like us to, for once, look ahead and foresee some of the foreseeable consequences and act to mitigate them before the bulk of the damage is done.

I don't think it's necessary to slow the development; gene therapy is too desperately needed, and slowing it down so that we can prepare is not going to cause us to prepare.