It wasn't just Kimmel, but Richardson, Kimmel, Stark, et al. However, reality is quite different. There is no meaningful long-range air reconnaissance being flown, and there is no inter-service cooperation to rectify this terrible oversight. Then, you have the US Army operating it's RADARs only briefly during the mornings, and lacking in an efficient method of coordinating the information received from the RADAR sites. So, the US admirals are worried about torpedo nets interfering with a speedy deployment, while lacking the tools necessary for raising the alarm that would result in this speedy deployment. So, yes, torpedo nets would have mitigated some, or maybe much of the damage to the battle fleet at Pearl Harbor. Incorrect, it was the "depth" issue that was the major deterrent in US thinking of a torpedo attack. As per Admiral Stark's February 15th 1941 memo to Admiral Kimmel If the US assumed arming distance of 200 yards is "taken as gospel", that would be a point about midway between the shortest distance between "Battleship Row" and the shoreline. If the arming distance is altered, as Stark's memo cautions, that would place the point even closer to "Battleship Row". Thus, according to the US, arming distance would NOT prevent a torpedo attack. Hardly surprising, as it was the easiest approach route to fly. It was a long uninterrupted approach over water that allowed for plenty of time to line up on either Oklahoma or West Virginia. However, by taking the shortest route there would be a lot of interference(turbulence generated by the buildings of the submarine base & supply base, several rising & falling air currents as the plane flew over colder water & warmer land masses) and precious few seconds to line up on the battleship target, achieve proper drop height & speed, before finally dropping the torpedo. That is open to debate. There had long been strong anti-Japanese/anti-Asian racism in America, although it was more prevalent on the West Coast. Whereas, Germany was liked and admired by some of the more important Americans of the day. Japan was seen as the most likely threat, because of their location to American interests in the Pacific. Whereas Germany posed no "direct" threat to American interests, and to an extent, was in lucrative business partnerships with several American companies. So, I would think that it require much less "provocation" to get a DoW against Japan than it would to get a DoW against Germany.