The assumption is actually if Obama and the pedophiles were in the same "International School". Even if it was at a different times, Obama and the teachers may have had dubious connections that brought them there.
Obama's entire elite education is sketchy for a boy from a white middle class single mother.
It was at Harvard where he was accused of sexually harassing other male students.
"During Barack Obama’s tenure as the president of the Harvard Law Review in the late 1980s, at least two male student editors complained to colleagues and senior university officials about inappropriate behavior by Obama, ultimately leaving their positions at the journal, multiple sources confirm to THE KANSAS CITIAN. "
http://thekansascitian.blogspot.com/2011/11/barack-obama-accused-by-two-men-of.html
I think you're jumping to an inaccurate conclusion.
By 1992, Vahey and his wife moved to the prestigious Jakarta International School in Indonesia, where he again taught social studies, coached basketball and developed a reputation for leading fun overnight trips for students.
When Obama attended school in Jakarta in the 60s and 70s, it wasn't this one.
He attended a couple of local schools.
Obama attended the Indonesian-language Santo Fransiskus Asisi (St. Francis of Assisi) Catholic School around the corner from their house for 1st, 2nd, and part of 3rd grade. ... From January 1970 to August 1972, Obama's mother taught English and was a department head and a director of the Institute of Management Education and Development. Obama attended the Indonesian-language government-run Besuki School, one and half miles east in the exclusive Menteng administrative village, for part of 3rd grade and for 4th grade.
http://en.wikipedia.org/wiki/Early_life_and_career_of_Barack_Obama#Indonesia