[Springtime]

I'd add too that often on such sites the range of submitted subjects are broad enough that those voting don't necessarily have domain familiarity or expertise, so when a comment reads like it has a solid argument readers may upvote it to test the robustness of its premise by way of seeing if others make more compelling counter-arguments or strengthen/agree with it.

Ie: the voters themselves may not hold any personal opinion on the matter.