My only reservation is that I might actually intrinsically value "innocent until proven guilty." Drawing the line between intrinsic values and extremely useful but only instrumental values is a difficult problem when faced with the sort of value uncertainty that we [humans] have.

So assuming that this isn't an intrinsic value, sure, I'll bite that bullet. If it is, would still bite the bullet assuming that the gains from preemptive imprisonment outweigh the losses associated with preemptive imprisonment being an intrinsic bad.