RPC Worm Cleanup Worm Appears

This is funky, if not anything else. There is actually a worm out there that cleans up another worm's mess and tries to secure a system. So can this be actually called a worm - it's like a sentry... Or is it? This new worm's author honestly wants the greater good of people using Windows: his worm downloads itself on the host machine, deletes all the bad stuff put there by Blaster, tries to download the patch applicable to the host, patches the hole and then self terminates - voila... Is this a positive step?