I hark back to school where we have 6th Formers (over 18) who mentor / tutor kids from as young as Year 8. They do this before, after school and at lunchtimes, completely unsupervised and no DBS backside covering. They are put into a 'position of trust' just as we do with senior cadets and have done for decades, bearing in mind that until 14 years ago many of these senior cadets would have been fully fledged adults and not just 18/19. As far as I'm aware there has been nothing on TV or media (pretty certain the red tops would have it on their front page) about anyone from the ATC being implicated in anything untoward, not unless HQAC have made sure that this fact stays hidden. if the latter is the case I would say that is worse than it coming to everyone's attention. Sometimes dirty laundry needs to be aired in public to ensure things get done.
Frankly there are more things wrong with the Corps to be more concerned about than cadet relationships, regardless of their ages. This is something for parents to deal with and not us, unless the parents bring it our attention and even then I would say the parents need to be a more involved.
From my time as OC I loathed cadet relationships, these as they were more divisive in terms of sqn harmony than anything else I ever came across.