The line of thought is, that there's always someone willing to contemplate an unpleasant act for shaky reasons, in decreasing numbers, down to a minuscule numbe

The line of thought is, that there's always someone willing to contemplate an unpleasant act for shaky reasons, in decreasing numbers, down to a minuscule number of people who would commit the worst atrocity for no reason at all. The risk comes from widening access to a given technology, and the amount of harm it could do. It's hard to calculate the risks, but bio weapons potentially have wide access and great harm.