Here are the details. Of course they were not fools.
There have been a lot of preachers, even some good men, down the years who did not like being called fools by the world, and when the world turned on them and said, ‘You fool. You preach about a Saviour who died; you say terrible things; God heaping out punishments upon his eternal Son.’ In the world's eyes that is all foolish and horrible, and so those preachers sometimes change their message, and soften it, because they simply cannot bear not having the respect of the world.