There are tons and tons and tons of reasons (tons) to be against the porn filters. "The government is going to tell people I looked at porn in order to assassinate my character" is one of the most far-fetched and ridiculous ones. If the government is dead-set on assassinating your character, then first of all, you have a much more serious problem on your hands than a lack of pornography, second of all they have far more effective tools at their disposal than "Hey, so-and-so, (maybe) wanted to see a boob once".