Should mentally ill or challenged people be accountable for their actions?

Say there's a half naked woman walking down the street and there's a fully clothed woman on the other street, the mentally ill guy goes after the half naked woman and slaps her bum, tell me why he should be held accountable for his actions when the woman should have been dressed more modestly? Mentally ill people can't control themselves.
Should mentally ill or challenged people be accountable for their actions?
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