Am I forgetting anything. I want to make a good, logical (not emotional)
case and hope I can convince them to not do this.

Here are some tips I collected to help them scratch properly

1. Hopefully he likes catnip. If so, rub it all over the scratching post.
Scratch the post yourself, if he still doesn't use it, take his little paws and
scratch the post with them and tell him he's a good kitty. Remember to
associate positive things with acceptable clawing and negative things with
unacceptable clawing.

2. Try a scratching mat. Some prefer horizontal over vetical surfaces.

3. Try sisal, rug, cardboard, fabric... covered trees or mat. You can get cheap
thin door mats and staple gun them to a cat tree. Use canvas if he really likes
fabric. Be sure the stapes go vertical like this "|" and not horizontal like
this "--" so they don't get their claws stuck in there.

4. Put double sided tape where he likes to scratch. They won't like the
stickiness. They may then scratch a few inches over from the tape so be
prepared to add more. Keep no. 5 in mind when using the tape.

5. Don't let him in that room where he scratches when you're not around. When
you're around stand gaurd with a squirt gun and squirt him from a distance when
he scratches the furniture. If he's real persistent, put a little bit of
vinegar in the squirt gun. You can also yell "NO!" when he scratches there. I
also like to take him away from that area instantly and take him to the
scratchy tree, hold his paws and help him scratch while praising him. Make it a
fun experience, don't hold him forcefully or he'll fear the kitty tree. Make
everything associated with the kitty tree positive. I sometimes will put a
scratchy tree close to the furniture they are clawing so they have a nearby
alternative.

6. Put vinegar where he scratches. They don't like the smell.

7. Try some of that cat away spray.

8. Try a scat mat where he is scratching.

9. Get rid of fabric furniture with vertical fabric sides. Get THICK leather or
wood sofa and chairs.

10. Try soft paws.

11. Try trimming his claws every ten days. Some do once a week.

12. Whenever you see him clawing appropriately, praise and reward him lavishly.
Continue to praise him forever or he may get lazy.

13. Try Feliway to calm them down.

14. Make sure your cat tree is tall and heavy enough. Big kitties will topple a
small light one with a small base. I put weights on the bottom of mine. I get
the big ones. I also have a multi-tier cat tree they like to rip up.

15. Try this product, a cat tree that attaches to the side of your couch.
http://www.birminghamind.com/Scratchaway/index.html