People do NOT walk around the world indiscriminately. They avoid bad neighborhoods, treat suspicious people like aliens, profile people in any way possible, and then react. Take a white male and walk them around times square, then a full body tattooed, gauged ear, sub-dermal implanted carnival exhibit and walk them through the same area and watch the difference in how people react. They may be the nicest person in the world but the women will still hug their purses and the men will lower their heads. Ever heard "Don't look at anybody on the subway/bus/EL/whatever"? It's because people acknowledge that there are mouthbreathing retards that will fuck you up because you looked at them funny or because they like your briefcase.
People DO interact with the internet indiscriminately. Most can't tell a good site from a bad site, don't know the difference between a "funnycats.avi" and "funnycats.avi.exe", blah blah blah blah blah. Chances are if you are reading this you have fixed someone's computer because of this haphazard e-disregard, so I don't need to tell you that most people just don't get safe browsing practices.
This guys issue is that there is a select, very vocal group of people who think they are safe on the net but aren't, so he wrote a proof-of-concept to show them that it doesn't matter what platform you are on, there is no replacement for safe browsing practices (and not using default passwords, and and and and and...).