I get why psychologically normal women would be unable to comprehend why anyone would willingly submit themselves to the emotional work and difficulty of making a false rape or abuse claim.
But not all women are psychologically normal. There is no reason to think there are fewer female sociopaths than male (although this claim is made, it is impossible in my view to back empirically), and given a strong enough moral justification–as they see it–many non-sociopaths could make and presumably have made, false claims.
Believe at first, but ask questions. If the answers do not add up, ask more questions. To ask people to do otherwise is to invite a culture of abuse. It is to invite a ready means of blackmail and extortion, against which we will have removed all remedies.