Dispersal of liability if something goes wrong?
It's not the ground-based targeting system so that company can't be sued. It's not the onboard nav so that company can't be sued. It's not the software so that company can't be sued. It's not communication latency or interference so we can't blame it on a bad command decision to push forward without more reliable data points.
The only thing that will ultimately result in a nuclear weapon being dropped is if the guy with human eyes is looking at the target, makes a judgement call, and pushes the button.
All that being said, we should not be building more nukes regardless. This is dumb.
Do people from Acre even exist though?