You and I may not agree on many things (or anything), it really doesn't matter. Your right to speak your mind is no more or less valuable than mine or anyone elses. (we mostly agree BTW)...
I have seen this happen several times lately, and I just don't understand it. Wouldn't making an argument, presenting your case, and either winning them over or not, be a better course of action than the "dickvote" oops downvote...

I had a perfect example of this happen today where I have fundamental differences with someone, had an exchange, mutually agreed that we both were assholes, and moved our separate ways - end of story.

I didn't downvote him just for disagreeing with me, and I will likely throw him a 50% sometime this week for standing his ground.

IDK - If someones material is indeed bad, there's no need for anyone to take it upon himself, the community will sort it out and prevail - eventually...

Edit - I had to go back in my posts to find this:

No one is inherently wrong just because they disagree with you…

Start with the most basic facts and look at this from the most basic level - to get on the same page, both sides have to at least agree on and get that out of the way first. When someone has an opinion on something, that person is not at fault for not agreeing with someone else who holds an opposite opinion. The idea itself, that someone has an opinion on something is itself predicated on the notion that they disagree with the other person who holds a different opinion.

Hmmmm...