Resolved: In a democracy, voting ought to be compulsory.

I was pressured to judge debate the past two weekends and was assigned Lincoln-Douglas rounds. The above topic was bandied about by our wonderful youth. I wikied compulsory voting and see that 10 countries currently have some use of it. Yet this last two weekends the only evidence offered referred to the policy in Australia. Any Aussies read here, or anybody else, care to share their opinion on the topic?