Media monitoring worker Regan Gibbons tweeted, "Really Sue, you couldn't give it a day before politicising this tragedy?"
Others described the tweet as "a sick comment", "a total disgrace" and "disgusting." One tweeted: "You are an opportunistic, moralising windbag."
Ms Bradford said she sent out the tweet - which has since been deleted - before knowing that two people had been killed and her sympathies were with the workers who died.
But she said she saw the problems with Work and Income first-hand when she joined other welfare advocates who were overwhelmed by queues of hundreds of beneficiaries seeking help on a three-day "impact" outside Work and Income's Mangere office last month, which placed the Ashburton killings in context.
"It was a terrible tragedy," she said. "But when a Government runs brutal policies that get worse and worse, including what we saw on our Impact just a few weeks ago, that is a risk that the Government takes with its frontline staff."
OK folks, can feel yr anger - a) tweet was b4 I knew anyone was killed; b)all workers should come home safe; c) apols to those offended