Never said they're all convinced of it. Just as all Germans weren't
convined of the views advanced by Hitler.
You don't need all of them. You just need *enough* of them.
Preferably, enough of them with guns.
Remember, too, that we just came out of the Earth/Minbari War about ten
years ago, when we stood at the edge of extinction. The threat of a new alien
race makes a good device.
jms