I can see both sides of this argument, and would tend to side with Webb over Brand (although Brand was extremely persuasive in his Newsnight interview recently), but also very much sympathise with the futility of voting for the sake of it. If none of the candidates for which you can vote represents your views, then by not voting you can’t really complain about who gets in if they don’t do what you want; conversely voting for the least bad option is giving tacit concent to that candidate.
What makes it even more frustrating is when the candidate and/or party you vote for gets into government and then completely ignores virtually all of the principles and manifesto commitments it made before the election. If that’s going to happen, and there’s not a damn thing you can do about it (other than pretend it won’t happen again when you vote), then perhaps there really isn’t a point in voting.
And don’t get me started on tactical voting.
Like I said, I’d tend to side with Webb’s argument. That Canada Bill Jones quote springs to mind, however, and it makes me sad.