You can already buy a CRISPr kit at home with everything you need to genetically modify a coronavirus to be dramatically more deadly with a long incubation time for maximum damage.

You can also easily build a drone with a GPS from commonly available parts, then strap a bomb to it made from match heads and PVC pipe and give it a destination to fly to.

There are an insane number of ways anyone moderately intelligent can cause a massive loss to human life if that is their goal.

We should be thankful most violent types are not smart enough to do anything worse than pull a trigger.

The only way to stop humans from hurting each other is strap us all in solitary confinement VR pods.