What's worrying is not that the bear can operate the Lightsaber, but that the bear is IMMUNE to the Lightsaber, which means the Jedi cannot help us defeat the bear menace any more. The Green Lantern Corps has already been defeated by the bears, now the Jedis too?
There's still hope he can be defeated by Wonder Woman's Lasso of Truth, but the problem with this scenario is that bears are notorious sticklers for veracity as it is.
"There is no escape," Darth Vader said. "Don't make me destroy you. You do not yet realize your importance. You have only begun to discover your power. Join me and I will complete your training. With our combined strength we can end this destructive conflict and bring order to the galaxy. Bear Skywalker...I am your father."
"No," Bear Skywalker thought. "That's not true! That's impossible!"
"Search your feelings," Darth Vader said. "You know it to be true!"