Sorry just catching up on this thread now...
in the examples you've given Im shocked that you are minimising the fact that they're sexual offenders, and providing excuses for it. 'he did not know
This comment was with regards to the fact that he didn't know the girls age. To be perfectly honest at 13/14+ I was in nightclubs. I did have sex whilst under the legal age on consent, 1 or 2 people I slept with didn't know my age. I'm not proud of that but never actually thought about the seriousness of it at the time. I looked 18, I was in an 18+ nightclub. Should they have asked for my ID? I don't think it's shocking for someone to say I didn't know her/his age. How many of us have asked for proof of age before sleeping with a girlfriend/boyfriend? People can lie.
but the same judge sent down a 17 year old boy for 47 years having consenting sex with his girlfriend that was 2 days off being 16
Really? 
I did find the way in which these sex offenders were treated by authorities very bizarre. There were notices on the doors of their homes saying "this house is not taking part in Halloween, please do not knock", they may as well have stuck an illuminated sign outside saying "paedo lives here
I wouldn't automatically say "oh yes that's a paedophiles house" I would probably think they were a Jehovah Witness. People will see paedophiles everywhere if they actively go looking for signs.
I personally have grown up in a nice area with 2 well known paedophiles in the village. I have chosen to move back since having my own daughter. They are left to themselves. I wouldn't approach either one to warn them off looking at my child, that's a bit insane and quite frankly it's also drawing attention to your child.
Most on this thread are thankfully sensible but bloody hell, some really are not.