There is no serious evidence, 60 years on now, that indicates anything of the sort took place in relation to the US letting itself be attacked. The only thing they can point to, which is common knowldege is the fact that US (and British) intel felt the Japanese were preparing for an attack somewhere in the Pacific/Asia area, but were not able to identify the exact timing, or exact target.
Singapore and Hong Kong were attacked almost at the same time as Pearl Harbor (within days) yet nobody accuses the British of deliberately "letting them". Interesting.
...The reason Japan attacked Pearl Harbor stemmed from their 1937 (2 years before WW2) invasion of China, and the ensuing oil embargo the USA placed on them. To suggest the USA was looking to sacrifice Pearl Harbors forces in order to have a war with Japan to get into WW2 is just flat wrong, and there is zip in the way of evidence or historical facts to back up such claims.