CRISPR is more discovery than invention as it’s the cell’s existing system for fixing errors in your DNA. So you already have it.

I’m sure vaccines may have been controversial for some initially too even though like CRISPR, they use the body’s immune system. A traditional dead virus vaccine makes your body think you have the virus so it prepares to fight it. When the real live virus comes along, the immune system is prepared.

So we now are starting to use CRISPR to fix/change other things. This one (brain cancer) is a great example. Could it be used for evil? Sure so could many things we use every day. A car can be used to quickly get you from home to work but it can also be used a weapon.