This is also a bit different. This man has the mind of a 7 year old and has to go with a carer. Really he IS a child. Why can't they make an exception and give him a special pass (so that the person letting him in knows its ok) If you are mentally a child you should be allowed to enjoy things that are appropriate to you, like Legoland.
Yes and no. That argument has been used to strip adults with development disabilities of their rights and justify horrific abuses for MANY years, and even goes on today.
They are adults. Someone can have the "capacity" of a 7 year old, but if they're a 40 year old man then they are a 40 year old man, not a 7 year old child.
That said, I do think the Legoland policy should be reviewed. If an adult with a developmental disability wants to go to Legoland, and they are accompanied by support staff that shouldn't cause any problems, but then again there isn't really a way for them to verify that people claiming to have a developmental disability and people claiming to be support staff aren't actually clever creepy people trying to get access to children. So there is that.
Anyway, adults are adults, regardless of their supposed mental age. Lots of developmentally normal adults love legos. Lots of adults with developmental disabilities could care less. And most adults with developmental disabilities still have all the same biological drives to reproduce that everybody else does. For some reason that arbitrary mental age thing also gives people the wrong impression that a child-like asexuality goes along with it too.
If Legoland's policy says no adults unaccompanied by a child, then I think they did the right thing according to their existing policy. If they change it, it's something that should be changed to include all adults with an interest in Legos though. Otherwise what appears to be expanding disability access on the surface is actually perpetuating institutionalized infantilization of adults with disabilities.