I think that is okay because there was no intent to create pornography there. It is a political statement. As far as I am concerned that falls under free speech. It is completely different from creating nudes of random people/celebrities with the sole purpose of wanking off to it.

Stuff about X-rays will be filtered, for example. You could probably go a little safer with the regex.

I did ask myself. Then I looked it up and the reason makes perfect sense.