I think we need to move the focus OFF the girls and onto the men
If we were better at getting men like this nicked and off the streets, then the neglected / previously abused / excitement seeking / whatever girls wouldn't be in danger in the same way.
We need to get rid of the predators much better and much more quickly, as there will always be people who will make good prey.
In the meantime - I suppose educate in schools, and on telly, make sure that it's not reported as being a certain "type" of girl as while many were vulnerable, not all were (apart from being young and naive), make sure that girls and women know that any and all reports to the police / SS will be taken seriously and treated professionally etc etc
Making sure that girls leaving care are very carefully supported would help.
Giving girls somewhere to go so they aren't hanging around the streets would help (this has always been the case with both boys and girls)
etc etc
Bottom line is though that as long as there are predators there are going to be victims, we need to get the predators swept from the streets. Make them think twice before doing this crap. Look at whether there are issues in different areas of the country, different backgrounds etc. Try and cut off at the root.