You need virus protection on Linux, there just isn't any.
When someone can be bothered to target you then you'll be stuffed.
If I write a new virus today tell me how your anti-virus will protect you against it.
No matter what the OS is the proper solution against viruses is the prompt installation of a patch for the security hole the virus exploits.
Once the OS vendor patches said hole, why would there be any need for an anti-virus program? It can't protect you against a new virus and there is no need for it to protect against holes that have been patched.
Anti-virus software is just snake-oil.