Monroe
Purple Belt
As has already been stated on this thread by others, while the American public largely wanted to remain neutral, the American government (and industry) was very concerned about what was happening in Europe and elsewhere. Watching trade partners collapse is not something that can be described as "happily watched". There was plenty of behind doors involvement prior to the American declaration of war. Do you think it was a complete coincidence that the British setup a spy school on Whitby prior to the Americans declaring war? Do you think it is a coincidence that the first directors of the CIA were trained there? Are you familiar with the early works of William Donovan, or perhaps why William Stephenson had his office for the BSC in Rockerfeller center from 1940?
The American government cared. The American people didn't. There's only so much a government can do without the will of the people in a democracy.