Actually, yes.
They are herding Homo Sapiens, a specific breed to be exact - the Homonius Sapienus Singaporeanus - know to be indifferent to social grace, safety needs and to block all forms of entrances and exits of transportation and thoroughfares, especially during peak periods where herd movement is at it's highest in the smallest area of land, and through decades of acute conditioning, will instinctively block the all forms of entrances and exits, disabling other specimen to enter or exit a particular area. The situation is exceberated the more densly the concentration of specimen is in a confined area.
One scientist observed that Hom. Sap. Singaporeanius will almost maliciously advance and force their way into an entrance or crevice of limited dimensions, the more limited, the more vicious their efforts, even though they appear to be intelligent enough to understand that by so doing, they are blocking the only available opening at a certain point disallowing other specimen to exit a confined area, and this act actually prevents them from easily entering the space speedily - identified to be their original intention. It is a text-book example of the 'reverse application of intelligence' (ref: University of Newton Circus Hawker Center Intelligence Studies, Prof. Tan Ku Ku, circa 2009).
The Hom. Sap. Singaporeanus also suffers from a peculiar optical disorder in that even with fully functional vision, many specimen have been known to walk directly into the paths of others, or actually crash into other specimen even while looking directly at them, and to use all means of carriage like preambulators and baggage to block the particular part of a passage where other specimen needs to pass by, even if there is more space on another side closer to them, thereby causing great inconvenience, or even danger. This is especially apparent on weekends and during intense festive periods in the hearts of the most densely populated or transited shopping areas.
