This, it’s a 3D tv without the need for glasses. Really cool on its own, but not a hologram

I think a lot of the fear stems from the fact that genetic changes are heritable and in some cases, contagious. When we start editing DNA directly, we're introducing a new biological process that has never existed in history, and thus could never be evolved against. Because artificial gene editing is an entirely new process from a biological view, there are no safety mechanisms evolved into our genome. In theory there could be great harm due to unintended consequences much like historical cases of european settlers wiping out native populations via disease, without even trying.

This could be a miracle treatment. Or, unlikely but possible, this could cause every affected cell to have completely junked DNA essentially dooming him to a slow radiation poisoning-like death. Or it could be anything between the two. We don't really have any (ethical) experience in using crispr in humans in vivo and the unintended consequences are unknown. The most likely outcome is that the viral dna is not completely eliminated and this is only a temporary treatment that reduces the need for anti-virals for a time until the virus is able to re-infect previously treated cells.