Tiny aside but I read something a couple of years ago which calculated from two different sources, one was self reported, and the conclusion was that approx 6% of men were rapists.
So that's more than 1 in every 20. Think about how many rapists that is in sainsburys, the office, among the school parents.
Then multiply up across the country.
It's really not that tiny a percentage at all.
And that's just rapists, not people who do less serious offences. I'll try and find a link