Just to keep hammering on this alittle here is an article in Wikipedia on the US Pacific Fleet in May 41:
“Until May 1940, this unit was stationed on the west coast of the United States. During the summer of that year, as part of the U.S. response to Japanese expansionism, it was instructed to take an “advanced” position at Pearl Harbor, Hawaii. Long term basing at Pearl was so strongly opposed by the commander, Admiral James O. Richardson, that he personally protested in Washington. Political considerations were thought sufficiently important that he was relieved by Admiral Husband E. Kimmel, who was in command at the time of the attack on Pearl Harbor.”
There was a reason for Peral harbor the US fleet was considered a BIG threat to Janapese ambitions that was why the effort was made to take it out.