I'm going to ask this as simply as can simply be asked:
In your opinion what is the purpose for the upvote and downvote? The general consensus is the upvote is for when we agree, but there is a dichotomy, or perhaps an even larger disagreement on what the downvote should be used for.
I think it's time to come to a community understanding of one another, and in my opinion this indiscriminate downvoting of comments without offering some sort of foundation on our disagreement or general apprehension to the topic is inherently threatening to the positive vibe of this community.
Discuss.
The only time I downvote is if something is extremely inappropriate, negative, trolling, or is degrading (IMO) to the quality of this community.
I never downvote when I disagree. If I disagree, I reply with my disagreement. I wish others would too. Not much to learn from downvotes. Lots to learn from discussion and healthy debate.
I upvote often, to anything that I think adds value.