Protection against known viruses is better than protection against no viruses. I agree some virus scanners are obnoxious but my virus scanner makes no problem for my computer, and it certainly doesn't invent virues. You are probably refering to bogus online junk you get which makes things up to trick you into buying their rubbish. You need to look out for those.
Maybe you know some people who screw up their computer by putting crap on it (the bogus scanners rather than a decent one I persume) but I also know someone who couldn't be bothered with virus protection and his computer got totally wrecked. My computer was on the same network but my scanner prevented the attack.
But up to you to weigh out the pros and cons for yourself I guess.
Edit: When I say totally wrecked I mean totally wrecked, and took hours to fix. And it was so preventable too.