Preventing a database from existing isn't gonna stop people with that capability. If they can make the targeted virus, they can forcefully obtain enough genetic samples from their targets to determine the information they need to do so.

The idea that a small technical road block will protect society from horrors is misguided.

Like it wasn't great for people that were identified in government registers as being in groups that the Nazis targeted, but they would have made up targets just the same of there were no government registers.