Even if they do use evidence they get the reasoning backwards. Today they announced that there will be a number 10 porn summit. This is happening because of the two recent terrible murders of children by paedophiles and the finding that they both had violent child pornography on their computers. The argument is that this violent pornography caused them to carry out their terrible crimes. Sadly for their argument there is no evidence that this is the right direction for causality. Paedophiles like seeing images of paedophilia. It does not cause them to becomes paedophiles it is a consequence of them being paedophiles. The same backwards arguments were used over violence and video games and is used against pornography in general. If you look at the Williams Report they found no link between porn and violence against women, neither did the Howett and Cumberbatch report and it was not until the previous government that any link was proven and this was based on two discredited reports from Australia and the US that were methodologically flawed.
What you are talking about if you force ISPs to block porn is massive state censorship on the same level as that in China or Iran. First it is hardly practical without serious consequences for service and speeds. Secondly it will block a large amount of non pornographic material while letting a lot of porn through. For example this blog article might be banned because I say porn so often but explicit sexual images will be hard to filter from twitter, tumblr and other social media. Unless they have associated meta-data or they are reported then it will not work. The reporting system will be horrendous to implement and enforce, just look at the current problems Facebook has. So we are going to allow the government to censor and force us to opt in to porn. What will they censor next? Will we all be forced to swallow a Daily Mail view of the world or we have to opt in to get the Guardian or the Independent?
Anyway as is usual with politicians it is just distraction from real issues that affect real people, like the NHS, the economy, tax cheats, education etc. All the things that affect everybody.
PS I just read this comment
6 MINUTES AGO6 MINUTES AGOI find so many of the comments very depressing. It is good that the government is taking the issue of the internet being used to circulate child abuse images and the proliferation and wide availability of pornography, seriously. Perhaps some of the writers would do well to read the report by Dr Linda Papdopoulos, which establishes a "clear link" between sexual imagery and violence against women.