I do think that they love us the best way that they can, but the love isn't as deep as the love we had for them because they are afraid of abandonment and being hurt by those who love them. Again, I think this stems from their childhoods.
Or, maybe it they do love us deeply and that's the problem? They don't know how to love that deep and fear losing themselves...It's so complicated.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson