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the same tools that would trivialize creating such a virus would also trivialize a cure.

I'd disagree, I think it is a lot easier to create a virus that wantonly destroys life than it is to create a cure that puts everything back together. I could email out a script that just executes "sudo rm -rf /" on everyone's computer, and it would probably ruin a lot of people's lives.

Additionally, cures by their nature will always lag behind diseases, people won't invest resources curing a disease that doesn't exist. A non-trivial amount of damage would occur before society reacted to the threat.

The parent's reasoning would probably apply more to a vaccine than a cure.

Also, it's not illogical for there to be a demand for (research into) protections against threats which have not materialized yet, but seem to have a chance of doing so. As the prospect of portable bioweapons becomes more likely, there will be increased incentive to come up with protections from those weapons, even if they have not yet reached viability.

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