I just read this entire thread and see NOTHING heartless in any of the responses.
A lot of them are varied but I didn't read anything that suggested anyone doesn't love their child.
It's hard being a parent, but the most rewarding job I've ever had. I always want what's best for my children but best isn't always pretty!
A couple of my thoughts on this:
An adult child is not the same as an aging parent. Aging parents are usually, but not always, compromised in some way that is out of their control.
Adult children however, are usually able bodied and just starting their lives. I've seen kids move back home for many reasons and haven't like what I've seen. But they weren't my kids so it's none of my business. It really depends on the circumstances.
My Mom instinct is always to fix and rescue but that's not good for adult kids. It's a hard call to be sure.
I'm not even going to comment of what this poster should do but I wish you all the best!! :D