There is already a content filtering system. One which you're deliberately circumventing by putting your NSFW tag later than the other tags.

Even by the somewhat fictional standard of steemit "flags", your post fits the description. It is intentionally miscategorized.

By the actual standard of an upvote or downvote, a downvote is appropriate because having this material show up on the front of the trending page or on people's feeds is harmful to the credibility of the platform. At least in this guys humble opinion. Maybe you disagree.

You and your supporters seem to be all freedom of speech, unless that freedom involves someone elses' freedom to vote their conscience.