You are allowed to downvote anything you wish. That feature is available for all users on every post and comment. However, you may also find that your downvote gets cancelled out by others who are not of the same opinion as you.
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True, but not germane.
Imagine the flipside.
Imagine a service set up to downvote posts which have been upvoted for the wrong reasons.
Would this not hurt the use case for steem power?
If you are selling a block of land, you get a better price if it doesn't contain patches of thorns ready to frustrate a prospective buyer's plans.