If this disease made your right hand fall off, everyone would be sounding the alarm. It doesn't. It might take someone who is in the bottom quartile for risk taking and move them up to the next quartile. Their behavior would still be within the bounds of normal, their friends might not even notice, but they might become say 50% more likely to die in a motorcycle crash.

The point being we don't really know the consequences, and it's probably a good idea to study this some more.