The same argument could be made of just about any Rabbi; a smicha line from Moshe is not credible; that is why almost all Rabbonim are chicken about executing or lashing anyone. If you have real smicha, you would be bringing Dayan Emet to Amalekites; not relying on the prophesy of Thomas Jefferson to declare war and raise armies.
On the other hand, you can learn from just about anyone if the Torah is a third part to the conversation.