Because 'believe' implies that there is no guarantee whatsoever? It's debatable if there is any unbiased foundation that reasonably helps to decide someone to '

Because 'believe' implies that there is no guarantee whatsoever? It's debatable if there is any unbiased foundation that reasonably helps to decide someone to 'trust' Apple or not. But the reason lots of people believe in Apples statements is the same they believe in their bank, lawyer or doctor: they believe in the integrity of the organization as long as they have no reason to distrust them. Of course believe can be proven wrong over time.