It's interesting to look at the upvote/downvote ratios on this story. On most stories, a common-sense comment gets a big pile of upvotes an a stupid comment gets a load of downvotes. What we're dealing with here is basically a political issue so I'd expect people to vote along party political lines (tories in favour of the original article and lefties against). Hence a fairly even split of up and down votes.
We might not necessarily see it as party political, we each see our own view as common sense, but that's the nature of politics.