"Trump Campaign" is Papadop. "Russian government" is Mifsud. Downer essentially trumped up a charge against the Trump campaign that would have been meaningless if described accurately.
Then I think you're foolish.
the Trump Campaign had received indications from the Russian government that it could assist the Campaign through the anonymous release of information that would be damaging to Hillary Clinton.
I haven't checked that but assuming it's accurate, if that is the information Downer passed on after meeting with Papadopoulous, I really don't see what the problem is. Would you expect the representative of the Australian government in the United Kingdom not to pass on information like that to Canberra if he was given it. Would you expect him to sit on his hands and do nothing?
It is part of his job to report information to the Australian government.
Information that Russians had dirt on a former US Secretary of State is definitely information that should be passed on.