If it fully met all their needs and there was a plan for supporting them appropriately in early adulthood, akin to the safety net and support a family should provide (not some crappy helpline number on a card), perhaps...
Considering how badly we are currently failing "looked after" children we need to get our act together properly, not just in an electioneering soundbite kind of way.
I vaguely recall reading several years ago about a boarding school that was set up to cater for children coming from situations like that, and was therefore run very differently to other schools. But it was years ago so I could be misremembering.