Depends. Do you want points, or do you want to say what you have to say?

And, there have been times when I have upvoted something I disagreed with, because it made me think.

if you are writing things to get blessed by votes, your incentive might be in the wrong place to begin with.

As an example, my point that it is fine to downvote for disagreement got a few downvotes. Ironic, no?