Ok, so you think it is absolutely ok to block other things alongside porn?
And you think technology is going to be able to keep up with these demands?
Right, so first thing to understand is that computers don't think. They will only do what you tell them, and they do it exactly, and they can't do any more than that.
So if you want to filter porn you need to tell computers what they need to block. And you need to tell them in terms they can understand. Eg. give them a list of keywords.
A computer will not understand the same definition of porn that you and I do. You can't tell a computer to "block anything that shows sexual content in a manner intended to arouse", it wouldn't be able to make sense of that. A computer doesn't get aroused, nor does it understand arousal, so it cannot look at something and think "this is intended to be arousing". A computer has to rely on solid bits of information.
On the internet that information is mostly words. So here's method one.
So you can tell it to "block any website with the word "porn" on it". And that'd work just fine.
Except it would block MN because we've talked about porn on it.
It would block websites set up to fight against porn.
It would block websites set up to help people get away from the porn industry.
That's ok with you?
But of course porn isn't the only word you'd need to block. You'd also need to block words like sex, penis, vagina, even pussy.
Still ok?
And I mean it wouldn't take much for the porn sites to just change the words they use.
On to method two
You could also block websites individually. So estimates from the beginning of 2012 put the number of web addresses at 233 million. It's being added to daily. In the first quarter of 2012 there were 7.5 million added.
So we're going to keep up with those how exactly? (See method one for why computers couldn't do it automatically)
Or method three
Again using web addresses, but instead of a black list you have a white list. So the govt decides which websites we are allowed to look at. That ok with you?
So yes, you could block porn but you'd block a huge chunk of the internet (possibly the majority) and it would involve blocking websites with advice and support relating to sex education and sexual health.
Still sound good to you?
So when they say blocking porn would involve infringing civil rights they are totally right.
As for technology keeping up? The day we invent a computer that can think and feel, sure. I can't see that happening any time soon. In addition there's a huge moral maze related to that.