"Innocent till proved guilty" is a good principle - but is hard to apply in cases where no trial is possible.
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There are two kinds of reason why accusations against high profile people may be dismissed out of hand. One is the case where the person is seen as too powerful,or where damage to an organisation is feared, etc. The other is where they are seen as incredible because the person is trusted and genuinely seen as above suspicion.

Neither kind of reason should be allowed to get in the way of responding properly to such accusations - but the distinction between the two should not be obscured. The first is a matter of corruption, the second is a matter of naivete. They both have to be resisted and eliminated, but the process of doing this is liable to be different.