Originally Posted by Henz
The reason why only Jedi/Sith make and wield lightsabers is because they are the only people who can safely and effectively use them.
Based on what? Grievous is neither Jedi or Sith, and he is one of the most deadly users around. At a time when Kenobi and Yoda are the only Jedi left, he says that lightsabers are still used in some galactic quarters. They are obviously not Jedi. Kenobi also hands his father's saber to Luke and isn't all "OMFG be careful with that!"