Matthew 5:28 and Romans 13:14 clearly forbids us to watch these things and it seems clear to me that unless we as a nation can turn away from this epidemic, we as a nation will be judged for it.
I can't see how Matthew 5:28 and Romans 13:14 "clearly" forbids us to watch "these things". Looking at a woman lustfully with the intent of trying to have sex with her (assuming she is not your wife) is what is spoken of in the first verse, not looking at a magazine or movie.
And the second verse is even further from forbidding what you think needs forbidding.
So you think our nation will be judged because of porn?
What will this judgment look like?
What do we need to do to prevent the judgment?
Eliminate all porn? But that won't be enough.
You're concerned about "any site which harbors content of a sexualised nature."
We will need to burn all the romance novels.
Outlaw video games.
Ban soap opera like television shows and movies.
Get rid of the clothing store catalogs.
Outlaw skimpy swimsuits. What is skimpy? Anything that shows more than your head, hands and feet.
What else? Where will it end?
Try Matthew 22:37-40. as long as you and your neighbor are observing those verses, stop worrying about what your neighbor is doing with his life.
Also try Matthew 7:1-5.
If all people observed these verses the world would be a much better place. I don't believe Jesus wants us to search all of scripture to find a verse and turn it into a mechanism to try to mold other people into what you think they should be.