Why not build a robot to guard monolith 24 hours a day?



He would be greatly observed and studied and killed if he acted suspisious. Chances are of course that if one were to kill Monolith, the whole intergalactic fleet (or something) would come over and kill whoever killed monolith, then of course mankind would kill the alien who killed the person who killed monolith and then the alien would kill the person who killed the alien who killed the person who killed monolith and then in the end, there would be no more intelligent life left.