Assuming there was nothing to gain, why might FDR simply dismiss the information indicating an attack?

December 7, 1941 began as a typical sunday for millions of American, but suddenly everything changed, irrevocably, in ways they would remember for the rest of their life

he believed that congress would be better not dealing with "lobbyists", or people who seek to influence (a politician or public official) on an issue, since historically, they had problems with these kinds of people. he thought lobbying produces benefits, but should be carefully monitored.