ISPs are not well placed to make judgments on what constitutes extremism  ISPs are businesses, not scholars or governments. They do not have the expertise to effectively define the parameters of what constitutes extremism or when a certain site is such, and cannot gauge the extent of damage the site is having. If governments give the power to ISPs to take down extremist sites they are giving these companies the ability to dissipate the freedom of the internet on the basis of its own judgment. [1] That is a very dangerous power to give the agents that are the gatekeepers of information to the people. Even if the state sets guidelines for ISPs to follow, it will be difficult to police their decisions effectively and will set the dangerous precedent that service providers should have a degree of power over what content citizens can consume. The ISPs also face the risk of legal challenge by groups blocked that claim to not be advocates of extremism at all so burdening the ISPs with long and costly court battles which would effectively be being fought on behalf of the government. Ultimately private actors cannot be given the authority of the public censor.  [1] Mitchell, S. “BT Resists Move to Make ISPs Block Extremist Content”. PC Pro. 7 February 2012.