A computer as judge, jury, executioner, president, yadda yadda yadda is a very bad idea. Justice must be tempered with mercy and government must be run with compassion. Pure logic doesn't allow for either of those. Spock's "the needs of the many out wiegh the needs of the few" is not a way to govern. If it were, then the infirm, mentally ill, elderly, even the poorest of the poor would be subject to elimination to provide for the largest collective group. Logan's Run (as b-grade as it was) did a great job in pointing out what happens when computers take over and try to make a utopian society. No one over thirty - every one was "reborn" (killed in the movie's reality) to make way for the younger generation of workers. Sure, hot chicks were aorund every corner and all of them wanted to fuck, but utopia was anything but.