There are ethical reasons - of course, but we should also consider safety; which will be a tough one for CRISPR for heritable conditions. What if a modification

There are ethical reasons - of course, but we should also consider safety; which will be a tough one for CRISPR for heritable conditions. What if a modification goes sour in the second generation? What if it leads to mid life cancer? It might be a long time before we know if this is genuinely safe.