The two players made headlines during cricket's showpiece event, wearing black armbands to "mourn the death of democracy" in Zimbabwe, but Flower believes the younger Olonga, the first black cricketer to represent his country, had much more to lose.
"He was a black icon in Zimbabwe and the perfect role model for youngsters," the 34-year-old Flower wrote in a column for Britain's Sunday Telegraph newspaper.
"The easy path for him to have taken would have been to stay in cricket and not say anything.
"I realise that he had much more to lose than I did over this issue and my respect for him is immense."
Flower, a world-class batsman who quit the international game last month after Zimbabwe's failure to reach the World Cup semi-finals, is playing English county cricket for Essex this season.
The 26-year-old Olonga, who went into hiding after the World Cup amid reports that the Zimbabwean secret police were looking for him, has also retired and is in England on a six-month work permit to play club cricket and do TV commentary.
Fast bowler Olonga, a gifted singer who has said he could look to music as an alternative career, played his 50th and final one-day international for Zimbabwe in the World Cup Super Six clash with Kenya in Bloemfontein on March 12.
"He is now getting his life sorted out over here (in England)," said Flower, who played 63 tests for Zimbabwe, making 4,794 runs and averaging a world-class 51.54 with 12
hundreds.
CAREER OPTIONS
"He is a smart, charismatic guy who will not be short of career options, whether it is cricket commentary, music or art.
"We speak regularly and have definitely become closer friends since we made our stand over "the death of democracy" in our country."
Flower added that he had mixed feelings over Zimbabwe's two-test series in England later this year.
"There will be demonstrations and I actually think that will be a positive thing, because it will give the human-rights activists a chance to highlight the problems in Zimbabwe," he said.
Zimbabwe will play two tests against England, starting at Lord's on May 22, and a one-day international tournament against the hosts and South Africa beginning on June 26.
"I have mixed feelings about whether this tour should take place," added Flower.
"But I do not think that sporting sanctions against Zimbabwe will necessarily work. They did during the apartheid years in South Africa because of the importance South Africans attach to sport.
"But the Zimbabwean leadership have their hands rather full these days, what with their own business interests and rapidly deteriorating economy - and an increasingly hungry, and therefore restless, population."
Zimbabwe was suspended from the Commonwealth last year after allegations that Mugabe had rigged his re-election as president.
Around half the country's 14 million people are suffering food shortages, a crisis which Mugabe critics have blamed in part on his policy of redistributing white-owned farms to landless blacks.
