Tantrum is exactly the right word. All nicey-nicey wants to play until he gets caught out then starts threatening all sorts of things. I can just imagine the call:
"Department of State, how can I help you?"
"I want to report some naughty people who are like the GMAT score scandal"
"Uh... the what, sir?"
"They are gaming the DV lottery system"
"OK let me put you through to someone who can assist you. Hold please."
{muzak}
"Hello, important anti-fraud officer here, how can I help you?"
"Hello, my name is alpacapolo4u4ever. I want to report some naughty people. They are gaming the DV lottery system."
"That sounds serious, how are they doing this?"
"They are on an internet forum giving people advice."
"Uh, ok... are they giving people advice on illegal things like fake marriages?"
"Oh no no, definitely not. They always warn against that.
"So what kind of advice are they giving?"
"They give advice to people to make sure their forms are correctly filled in and that they have all the correct documents to bring to their interviews".
"Are they charging people for things that can be done for free, like filling in forms?"
"Oh no, they always warn people about agents that do that too."
{silence for a few beats}
"Um, ok mr alpacapolo4u4ever, I'm not sure what the problem seems to be. Sound like a nice bunch of people trying to help people legally get their visas. Is there any other information you can give me?"
{mr alpacapolo4u4ever throws a tantrum, threatening to report the officer to the President, then slams the phone down}.