No, there are no enemies as part of the swarm. Members of the mining swarm don't have the capacity to do any actual damage and that's part of the beauty of bitcoin. You can help or you can ignore it but you can't really do anything worse than neutral to it on a global scale.

They might not be true believers but they are certainly not hurting you. In fact, their interest leads them to have bitcoins in their virtual pockets and eventually they'll have to start spending them. Right now, they're spending them on Dollars and Euros but that's certainly better than nobody spending them on anything.