Telecoms and other net neutrality opponents usually try to paint the regulation as anti-free market, but they've lately raised the specter of terrorism. Supposedly, it might prevent internet providers from blocking extremist sites. It's a big enough concern, in fact, that Senator Dianne Feinstein wants reassurances that this isn't actually a problem. The California politician has written to the FCC asking it to "clarify" that net neutrality rules still let providers silence content that encourages illegal terrorist activity, such as the bomb-making instructions in al Qaeda's Inspire magazine. Feinstein doesn't necessarily believe the telcos' rhetoric, according to the letter -- she just wants to eliminate the ISPs' "confusion."