I don't think this "infantilising" line is quite accurate.
What people are saying is that their very upbringing placed them in a highly unusual set of circumstances, and to acknowledge that our upbringing stays with us is not infantilising, its contextualising.
Saying that is not making them the children/victims and trafficked girls everywhere somehow non-victims; that's a non-sequitur.
I accept some posters have raised issues around age/consent on this thread, but that is not an issue to conflate with infantilising B and E. It is perfectly possible to see the issues as wrong regardless of age or consent, but still not feel there needs to be a "choice" between not caring about trafficking and vilifying B and E for something I don't think anyone alleges they themselves have been directly part of. The two positions of sympathy are not mutually exclusive.
I have no reason to believe that, if confronted with hard evidence, E and B would not be appalled by the behaviours that form the basis of the allegations. But let's see what happens before we all jump.
We don't know what they know, we don't know what has been said, or is being said behind closed doors, and we don't know where things will land when the saga plays out.
For the time being, it strikes me as a casting about to see who else in the royal family can be targeted in a kid of "scooping the pool" of shame in the wake of Andrew handing back his titles. That seems to me rather small. That also doesn't mean I somehow don't see a problem with trafficking.