This happens because people want a disagree button, but have only a milder version of flag button instead. Sometimes one just wants to support a viewpoint without bringing additional arguments.
I think it would be better to display separate agree disagree and flag counters on each post, and not reduce karma if there are more disagree votes than agree.
I think it would be better to display separate agree disagree and flag counters on each post, and not reduce karma if there are more disagree votes than agree.