And, for the matter: people sometimes downvote posts just because they find them abhorrent.
Take, for example, an art sculpture depicting a nude woman. Some say it should be looked at as what it is - a work of art. Others say it is obscene. A tiny but extremely vocal minority says it must be removed OMG FOR THE CHILDREN!!!1
Now, who is being immature, those who think it's a work of art, those who think it's obscene, or those who want the sculpture destroyed out of irrational fear of corrupting their children?
Then there are people who downvote because they like being haters.
I had
one of my posts severely downvoted simply because I posted a picture of my MBPR. A lot of people think it's hideous and say I need to kill it with fire. Who is being immature, me or all the people that disagreed with how I 'decorated' my laptop?
Many nuclear power opponents get lots of media coverage saying things that have no scientific or logical basis at all. Many people believe them. Does that mean they actually know what they are talking about? What's happening here is different topics entirely, but the basics are the same.
All those downvotes/upvotes mean very little. The system is ripe for abuse. If you really want my opinion on this matter - remove it completely, including the upvoting part. But honestly, I don't care.