So are you suggesting that the firing was done without the approval of Jefferson Davis? He appointed Beauregard the commanding officer in Charleston on March 1. His war department issued the order to Beauregard on April 10 to demand the surrender of Sumter with the orders to open fire if a date for surrender was not provided. If there was a hot-head in this it was Davis himself. He gave the order. He bears the responsibility.
I think that is most likely true, by far.