An explosive freighter attack on Pearl Harbor

Would a Halifax-style explosive freighter attack at Pearl Harbor intensify the US response?

It would not fundamentally change US determination to fight Japan, though a successful harbor explosion might damage the fleet more severely than the historical raid.

Alex answers no to the proposed change in the American response. He nevertheless suggests that an explosive freighter, if successful, could cause more damage to the fleet in harbor than the actual attack did. He immediately adds that the United States had already expected war with Japan. The proposed damage remains unquantified and conditional on the attack succeeding.