He's CRISPRing was unethical, dangerous, and possibly ineffective

Chinese scientist He Jiankui’s defense for CRISPRing those twin baby girls was that, by tweaking their genes, he protected them from HIV. That rationale is not only unethical, opines Stanford law professor Hank Greely, but it’s scientifically flawed: Turns out, it’s unlikely the children will actually be protected from an HIV infection.

That means, in essence, that the entire rationale of the gene editing experiment is moot, Greely said.

“Nature is complicated, viruses are tricky, assumptions are dangerous — and He Jiankui’s experiment was, amazingly, even worse than I first thought,” Greely writes.