For most specific problems thrown at supercomputers, you can go 30 times faster with a custom hardware architecture baked into silicon
Perhaps that's what they should do. Make a robotic silicon wafer fabrication facility part of the computer. After being given a task requiring a new architecture, it creates the architecture it needs and augments itself. I'm sure for less than the cost of the F-35 program, a universally tasking self augmenting supercomputer could be made to happen.
I suppose if you see someone planning to shoot a third party you might manage to hack their rifle, but there's several ways to interfere with sniping if you can manage to be behind the sniper.
Seems like about the same question.