Blue Badge Rant

Hoping GNs can give me their opinions on this - will probably have to take cover behind the sofa!
Last week DD2, a full-time wheelchair user, her baby and I visited Tynemouth to use a beach front restaurant - accessed down a very steep road, too difficult to negotiate in a wheelchair, but at the bottom are 5 wide disabled bays. When we arrived they were all taken - one by an elderly couple who sat staring at the sea, drinking from a flask. Another car (blue badge) arrived and reversed into a space clearly marked for the RNLI only and also just watched the sea!
Eventually, one of the other badge holders returned and we got her space, so we were able to get to the restaurant. The occupants of the first car watched us intently as I unloaded DD's and Baby's paraphernalia.
The occupants of both other cars (yes, badge holders) didn't get out of their vehicles at all, or use the restaurant facilities and both left at the same time we did.
AIBU in thinking that they could and should have used one of the ordinary spaces to watch the sea, or any of the other vantage points - even parking on double yellow lines with their badges - and left the spaces near the beach for those who actually want to get out of their cars and do something? We hear constantly and are rightly angry when able bodied people take up Blue Badge spaces, but what about Blue Badge holders themselves, who take up a space they don't actually need? DD2 is now parking in a wide Parent and Child space, to free up a disabled bay where available.