porn is an integral and important part of human life. Just because it is now on internet, it is not different from traditional brothels and Mujras which are going on for centuries if not longer. What internet porn provides is actually much better and safer form of entertainment compared to the traditional formats for both the viewer and performer. *
yep they are going on for centuries...but what happened to those nations who exercised those practices, is also mentioned in Quran.
Viewer has his privacy and safety of watching it from inside his home, while the performer has safety of practicing it from a distance and to a much larger audience. It prevents the abuse and violence which otherwise is a common thing in brothels and Mujras where viewers/visitors get drunk and lose control over there senses.
the aspect you mentioned is called Voyeurism, where viewer secretly tries to gain se*ual pleasure.
though your idea of disruption do formulate a solid base, but Voyeurism is load corrosive then you can imagine as it directly affects your mind, you personality and makes other conclude that the person is not of a strong character who dont even have controls on their nerves.
ps. viewing, or performing such action is not a good practice, period.
ALLAH SWT humain inhi occasions per hum-main azmatay hain, cuz it is not necessary k abb war he ho or app ka Iman check kia jayea