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> Does anyone know if anyone has ever made a virus who's only purpose is to remove other malware?

The first computer virus was an experimental self-replicating program called Creeper.

And the second computer virus was Reaper, a similar program created for the sole purpose of deleting Creeper.

http://corewar.co.uk/creeper.htm

Not only that, but even human immune system can instruct other cells to self-destruct, if it detects they are infected! So what Janit0r is doing is kind of similar to that approach.

A brief history: https://en.wikipedia.org/wiki/Anti-worm

Yes, such things exist, but they are still technically malware.

It's a risky approach. It could have unintended consequences. If it's a worm, it could spread out of control and cause considerable harm purely from its transmission.

As attractive an idea as it might be, it's dangerous.