We don't think that corporations should have the power to censor the ISP for not blocking content. It's not the ISP's job to censor the internet, it's their job to provide access to it, period. If there is something illegal going on, go through the proper authorities to get it dealt with.
If the ISP wants to voluntarily block a site, fine but it's not their responsibility to police the internet.
Road construction crews put the highway down for us to drive on. Should they monitor and limit the speed at which we drive? If not, why not? Oh, it's not their job.