Here are a few ideas for you:
I own all the DVD's I've copied on to my hard drive multi-media center for my ease. Yes I'm lazy after a long day.
Young kids seem to be rather cavalier about things such as PB&J, buttered popcorn and such when handling their favorite movie dvds. Try finding the DVD box after a sat morning movie fest. Heck, try finding the DVD. Scratches happen.
Sometimes I load a few movies on my laptop for times when I'm away from home.
I consider them to be my property just as my books are. Quaint idea, that isn't it.
"Movie DVDs aren't worth back up"
Sez you. Some of the DVDs I have never had a broad viewer base. Even finding one copy has sometimes been difficult even on the bargain rack.
I suggest DVD-Shrink. For those DVDs that DVD-Shrink can not decrypt, use Slysoft Any-DVD in conjuction with DVD-Shrink.
When was the last time you made a photocopy of an entire book? Do what you want, but you have no ~right~ to think if you buy something once and break it, or scratch it, you shouldn't have to buy another one... These people are in the business of selling copies, not lifetime memberships.
If you want to copy something onto your computer because it's easier, fine... but it's not legitimate. Everyone in prison is innocent, and everyone who wants to know how to copy movies just wants to copy DVDs they rightfully own, right? :~)