I suppose that it would be theoretically easy to disable the ejection handles when the plane had the canopy open, was not moving, and/or was on the ground. But

I suppose that it would be theoretically easy to disable the ejection handles when the plane had the canopy open, was not moving, and/or was on the ground. But if the plane was damaged and the sensors or circuits that managed that decision were destroyed, the pilot couldn't eject. They decided to err on the side of allowing the pilot to eject, possibily in a state of panic or confusion, under conditions that could be fatal. They did this instead of preventing this death caused by human error but opening the remote possibility that the best redundant system they could devise would fail and leave the pilot unable to eject. That says something interesting about their safety philosophy.