Personally it looks like an uprising. The president, who was also a friend, as noted as them riding the bike together and talking on the telephone in the beginning, whereas the friend who became the president started climbing the ladder of success, as noted by seeing him shake hands with a corporation owner, with a backdrop of a company's profit skyrocketing, and eventually the man becomes the president, whereas his friend sees him lying his way up to the spot, and becoming more and more corrupt. Eventually, that corruption shows up in his presidency office, and his old friend starts an uprising against the government, and that tall tower would represent the capital building or the white house, and during the march to the capitol, the riots get violent, forcing military action with them. The riot guards in the end must represent the secret service, protecting the president no matter what, even with his corrupt office.
That's what I originally though.
Now, here is the bigger view, combined with Asa's theory, that the uprising represents the countries of the world, the president is the US government, corruption and all, ande the secret service are the U.S. military, with the somewhat peaceful protests so far, they start to get violent, throwing objects, aka missiles or something, at the military, and the military open fires on the country. The president sees what he has done to the world, and has a look of horror on his face.
Eh, not really everything in my theory, but whatever.
