Except the two aren't the same.  The house is a tangible asset traceable to the proceeds of the crime.  While the degree may be traceable to to the crime, it's not a tangible asset.  If someone steals something (and by something, I mean a tangible, identifiable piece of property), then I'm all for ordering that it be returned.  But when a child is brought into this country by their parents, their presence here isn't like a piece of property, it's much more like the college education.  It's an intangible, ephemeral concept that can't easily be divorced from the person who possesses it.   

And worth noting that in most cases, the house wouldn't be seized.  If there was a crime of violence, there could be a lien against the property, but it wouldn't be an eviction of the children living there.