Appearing before Parliament's International Development Committee, Oxfam Great Britain CEO Mark Goldring repeatedly apologised for a lack of transparency and urgency in handling the original allegations.
Goldring said he regretted making comments in the Guardian newspaper suggesting that the response to the scandal had been out of proportion because no one had "murdered babies in their cots."
"I should not have said those things. It is not for Oxfam to judge issues of proportionality or motivation," he said. "I am sorry, we are sorry, for the damage Oxfam has done both to the people of Haiti but also to wider efforts for aid and development by possibly undermining public support."
In addition, Oxfam said Tuesday that about 7,000 individual donors have cancelled regular donations in the past 10 days and some corporate sponsors are reserving judgement.
Seven Oxfam workers were fired or resigned in 2011 after a whistleblower accused staff members of misconduct while working in Haiti after the 2010 earthquake that devastated the country.
Goldring said that with hindsight, the charity's leaders made the wrong call at the time of their initial investigation about how much information to give to the public and government authorities.
But he said he believed those decisions were made in the interest of continuing vital aid to desperate people.
"At the time, I suspect there was a balance of saying 'Oxfam is delivering life-saving assistance to a million people in Haiti ... We have got to keep that work going'," he said.
"That's shocking," she said. "You are all supposed to be good people trying to help the world, but it would appear you are not as good as you should be."
British lawmakers also questioned officials from Save the Children UK amid concern sex predators are targeting aid organisations because of the chaotic environments in which they work.
"I have seen it argued that if you work in a difficult and dangerous place, you should somehow be subjected to a different set of rules, that the standards should be lower," he testified.
"There is only one rule that should apply to our mission and our organisation. That is that you treat other people as you would expect to be treated yourself.
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