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Sublime said.. 
Not only completely dishonest, but so ignorant that anyone who believes it must be as gullible as a four year old. The truth (not that conspiracy liars know what truth is) is that LOTS of people study what causes bushfires, and they are NOT being started by some minions of a nameless conspiracy.
Lawyers from both sides often get investigators in to work out where bushfires start and create major insurance claims. The insurers and their investigators and consultant scientists sometimes have many millions on the line. You'd have to be a complete tool to think that they wouldn't have uncovered evidence of a conspiracy.
The police also investigate how bushfires start. So does the fire brigade and the BOM and the Fire Control Centres know that they are often started by lightning strikes, for example, because they can detect lightning and try to get into the fires it causes ASAP.
But it's at ground level - or actually fire ground level - where we know that anyone who believes in this meme is a complete fool or completely dishonest. Volunteer firefighters - the ones who actually get out with a hose in front of the flames and lose their own time and money putting themselves at risk to help others - get DEEPLY pissed off at the people who start fires. As soon as the situation gets under control one of the first questions that gets asked amongst the smoke and water is "what caused this".
For example, a few weeks ago there was a fire two properties down from mine. Our brigade was just on standby in case the fire jumped the river, but afterwards I went around to see if the neighbour wanted to put any stock on my place. Within a couple of minutes I'd found out exactly where and how the fire had started and been shown the exact spot where a car in an amateur rally had come off the road and sparked off the fire in deep dry grass, because to people on the land and firefighters this information is vital and very interesting.
A couple of weeks ago I was driving to go sailing in a howling north westerly and ran into smoke coming across the highway and a grass fire getting into the trees to windward of the highway. A guy from another brigade also hit the brakes and we whacked out spot fires getting across the road with boots and branches until the town brigade and an RFS truck got there and I helped them bowl the hoses out. The RFS captain asked us how the fire started and when we told him that a fencing contractor had been sparked it by using a grinder (against the law because there was a total fire ban) he got narked and went to give the guy a piece of his mind and a fine. As I was walking back to my car I heard the captain of the town unit get the same news and announce to his guys that he was also going over to make sure the contractor got all the penalties he could cop, because the fire damn near got away big time. Within a couple of days people from the sailing club who work in the regional fire control unit were mentioning the muppet with a grinder.
That is the sort of thing that makes this meme such a liar's or fool's fantasy. There's 144,000 average Aussies who are bushfire fighters (and lots of farmers with their own firefighting gear) who are out there on the fire ground and trying to work out who caused fires. No conspiracy can be out there lighting fires en masse without them finding out.
The scum who create memes like these are claiming that hundreds of thousands of their normal fellow men and women are either morons who have failed to see this BS conspiracy, or they are part of it for reasons the cowardly lying conspiracy theorists won't reveal.
If the conspiracy liars are going to throw such vile insults at volunteers who risk their lives then the volunteers should let anyone who is a conspiracy liar protect their own property themselves. Since conspiracy theorists are almost by definition cowards, I bet they'll run screaming.