He didn't do anything to encourage her? Apart from say it was written in the stars, bring in a condom, drive her to places to have sex with her? This judge is a complete idiot.
I'm a teacher. It's very easy not to have sex with the kids, as you have the power to tell them to speak to you appropriately, tell them to get out of your classroom, report inappropriate behaviour to your line manager. We have child protection training which we have to update regularly, which reminds us not to have sex with the kids so he can hardly claim to have forgotten.
Did the judge not realise that a 15 year old who pursues a 44 year old teacher clearly has problems? 44 year olds should be wise enough to know that said 15 year old is not bowled over by looks and charm but probably needs attention, has a poor home life and a father issues. She might be intelligent but she's 15. He took advantage of her.