My cat Saudi was already declawed when we got him and he "sharpens" his claws every night. He has never wanted anyone to touch his front feet either. I feel bad for him but he was already declawed when we got him. He is the boss here of 12 others so he does show them he means business when he's around even though he doesnt have claws, all he has to do is give them the look and they back away.
Our two RB boys, Gryphon and Nibs, were declawed when we got them. I never saw Gryph "sharpen his claws", but Nibs did it all the time. He also got h*** for it, not because it was going to do the furniture any harm, but because Shasta still had all her claws, and we needed to be consistent with them.