It's not that noone cares, it has more to do with not wanting to get into arguments and not hurting people's feelings. This has happened on hubpages and has upset several people, putting them on the defensive.
Writing is a very "personal" thing. No matter what the writer is writing about, he or she has to put himself out there. And for some, negative criticism may be too much to take, depending upon at what juncture they are in their writing ability, career, etc.
I haven't checked out your profile, so I don't know how long you've been on hubpages. It might make a difference, as to the kind of criticism or the lack of criticism you're receiving, if the other hubber who has read your stuff knows you well, he or she may be more forthcoming.
*Just checked out your profile. Haven't read any hubs yet, (but I will). I'm thinking if you told other hubbers a little bit about yourself, it might help them feel more comfortable about writing to you honestly. In otherwords, "Who are you?"
Also, some other hubbers may not feel qualified to give you the kind of criticism you're looking for.