Why is Abbott Accusing Garrett of Murder?

Does anyone else find Mr. Abbott's persistent attention on Peter Garret strange? I'm not sure about it as far as a tactic. He and his party have been relentless over the last few days, demanding Garrett be fired and even attributing responsibility of the four deaths to the Minister. It's a fairly heavy accusation that Abbott has likened to industrial manslaughter, and thus a fairly big swing, yet no one seems to be supporting the claims outside of the party.

The opportunity Abbott might be taking is that a high profile member of the Labor party is vulnerable, and in order to weaken the PM, Abbott is trying to scalp the Government's famously bald Minister for the Enviornment. If Garrett was fired, the far left votes he might bring wouldn't be likely to swing to Liberal, but as far as broader strategy, Abbott would have ammunition to attack the PM closer to election day by running smear campaigns showing a Labor government who mismanaged to the point of death. A party who have to fire their own are a party open to such an attack. We know for certain that Tony Abbott is running a negative campaign, and a bloody scalping can only help as a means to that end.

If this is the strategy, than the seeding tactical stroke is flawed when the Opposition have no support for their claims against Mr. Garrett. The Construction Union (CFMEU) have not only said Garrett shouldn't be fired, but that they are responsible for keeping their workplaces safe. The CFMEU's only criticism in the whole affair is that the scheme under question should be suspended. The Conservation Foundation, who admittedly might be Garrett supporters anyway, have said the scheme should stay active because it saves the equivalent of 1 million cars per year until 2020.

So where are the lobbyists and industry bodies supporting Abbott's cries that the Minister be sacked? Can anyone point them out to me, seriously, in the comments section? If there are none, then why is Abbott harping on about this for so long? It doesn't seem that strong an issue.

UPDATE: Wow. It all comes out! So this is why they made such a big fuss over it -
http://www.theaustralian.com.au/news/pm-changes-direction-on-climate/story-e6frg6n6-1225834964124
So Mr. Abbott gets his scalp...sort of. KRudd may be trying to dampen the full victory Abbott can claim by only demoting and not sacking, but the papers are all screaming, "SACKED!" anyway, despite then explaining only an inch down that it was a demotion. Garrett steps down from a role and keeps his other two. Are those other two very politically important? Not really. Without the global warming protection part of his folio for the environment, he's farily toothless, the old Oiler. In the end, his real chance to get something done in politics after singing about it for years turns out to be a bit of a non-event. What a waste of credibility, Pete.