(Perhaps @ShootTokyo can share some insights on this.)
The negative and positive experiences of cities that have hosted the Summer Olympics:
1972 Munich. The Munich Massacre.
1976 Montreal. Olympics boycotted by 29 African countries after the IOC refused to ban New Zealand over its rugby team playing in apartheid South Africa. The Montreal Olympics cost Quebec $1.5 billion to host and took 30 years to pay off.
1980 Moscow. 65 countries boycotted the Olympics over the Soviet invasion of Afghanistan.
1984 Los Angeles. One of the most positive and successful Summer Olympics: “The 1984 Summer Olympics are widely considered to be the most financially successful modern Olympics and served as an example of how to run the model Olympic Games. As a result of low construction costs, coupled with a reliance on private corporate funding, the 1984 Olympic Games generated a profit of more than $250 million.” (LA)
1988 Seoul. Several years before the games, North Korea’s plea to co-host the Olympics is rejected. Eight months before the Olympics, a Seoul flight mysteriously disappears off the coast of Burma. Kim Hyon Hui admits to being a North Korean agent responsible for planting a bomb on the flight out of revenge for the rejection to co-host. (Seoul)
1992 Barcelona. As a result of infrastructure spending to prepare for the games, “unemployment dropped dramatically, from an all-time high of 127,774 in November 1986 to a low of 60,885 in July 1992. Olympic infrastructure created for the games is thought to have provided over 20,000 permanent jobs for Barcelona.” (Barcelona)
1996 Atlanta. The Centennial Olympic Park Bombing. (Atlanta)
2000 Sydney. One of the most controversial Olympics due to multiple athletes stripped of medals for performance enhancing drugs (PEDs), a Chinese gymnast lost her medal for being under age, and regulations were not consistently enforced. (Sydney)
2004 Athens. In spite of initial concerns about security, humidity and high air population—at one point the IOC considered moving the games to another city—the Athens Olympics went extremely well. (Athens)
2008 Beijing. Forced relocation of over one million people for the event. (Beijing)
2012 London. $14.46 billion was spent preparing for the Games. (London)
2016 Rio. Forced relocations: “While some of these residents have been moved to housing estates near their original homes, more than 8,600 families have been moved to the city’s West Zone, in some cases up to 60km away from the city centre. Housing advocacy groups say local governments in Brazil are using the coming Olympics to justify forced evictions and segregation in Rio de Janeiro.” (Rio)