Sorry, but making the argument that people don't need to exercise common sense when walking in public spaces is also gross. More importantly, it's counterproductive to the cause you and I (someone who walks a good 15 or 20 miles per week in a major US city) both believe in.
@dangoodin @mbonsma @chu I feel like I can miss pedestrians all day long, and I bike across Harvard Science Plaza and Cambridge Common 10 times each week. What's so hard about looking out for other people?