[habith]

I'm pretty sure it's about the ethics of altering humans and a fear or a resurgence of eugenics.

That aside, I'm also pretty sure someone reviewed his work and found out that his HIV-immune mutation was not done correctly, it's a bit late for me to find a link, will update later if you're interested.

Edit: Nvm, someone else posted a better answer: https://news.ycombinator.com/item?id=18798764