Changing "trust" to "believe" advances the discussion not one whit. Alice trusts Bob to sign keys accurately; Alice believes that Bob signs keys accurately. The change doesn't add anything.
In fact if anything it's a step backwards. Trust is a specific form of belief; it is a belief on which the holder is placing some reliance. By substituting belief for trust you lose information. You go from a more specific term to a more generic one, a sign of sloppy thinking. It's a sad commentary on the intellectual level around here that a fatuous old windbag can propose such a counterproductive change in terminology and get his spineless lackeys to salute him for his "wisdom". Meanwhile those who know better are intimidated into silence.
