-It’s okay to give Yoda and Palpatine lightsabers, but they should only be used when fighting other lightsaber wielders, not each other.
I don’t really see Palpatine humoring any low-level Jedi with a lightsaber duel. Why would he bother with that?
Because he enjoys it. He knows he can beat them regardless, so why not have a bit of fun in the process.