During the time Obama’s mother was in Jakarta Indonesia was a fervently anti-Communist state (indeed there would have been no need for the US to get involved in Vietnam if the government had been paying closer attention to what was happening in Indonesia), it was also a staunch friend of the United States and in receipt of vast amounts of aid and trade.
Obama can get blamed for a lot of things but his mother’s sojourn in Indonesia is nothing to be worried about.
His mother’s time in Indonesia doens’t bother nearly as much as Obama’s time in a muslim school during his formative years.