The things they are picking out have really nothing to do with the "science" part of the equation.
The real damage is in public relations, something which science as a whole is horribly terrible at, IMO. Good science will be destroyed by badly handled publicity 10 out of 10 times.
Moray clearly you are a obviously good scientist. Quite often the most strident defenders of the AGW are in fact scientists. I crossed swords with a couple on another forum. I'm even married to a scientist, a very good one. Scientists know how it works and they trust the science. Their not unreasonable assumption is that the science is rigorously scrutinised, peer reviewed objectively and open to change as new data becomes available. That's the test.
But can you honestly say that hand on heart the IPCC report maintains that standard? I chose the quotes carefully because quite clearly you are implicitly accepting that the report is flawed. In fact you cannot escape that truth. The glacier thing, the missing Chinese data and these anecodotal reports masquerading as scientific conclusions. These should have been there, particuarly the Himalayan issue as it was known to be false and was included anyway. Saying it was 'badly handled publicity' simply isn't an excuse.
They should not have made into a report which was purportedly the conclusions of numerous experts in the field of climatology. That is not science and it cast doubts on the underlying science. The CRU emails are also very revealing and considering a great deal of the IPCC report was based on conclusions supplied by the CRU only adds to the doubts.
You say
The people that are attacking them know they have pretty much zero to do with the actual science..... but they have interest in seeing it fail at all cost.
That's the warmist version of the conspiracy theory. I'm sorry, explain to me again why they want it to fail? That implies they know AGW is real but want it to fail for some devious reasons, probably to do with oil companies and profits. They apparently know the 'truth' but don't care about the fate of the Earth and it's denizens. On the other hand someone like me you will accuse of not understanding the science. I'm not a scientist after all, just a dull pilot. I can be dismissed as a dupe of the denialists who cannot and will not understand the pure science.
But I would accuse you not understanding human nature. Scientists are not immune to it. If anything came across from the leaked emails it's that scientists are human like the rest of us.
The reality is that the science, the real science has long since been left behind and been replaced by a quasi religious process. The conclusion that we humans are causing climate change, specifically warming was reached many years ago. All research since has been aimed a proving it and finding the mechanisms but all the while there is an essential belief that the Earth is warming and is warming because of carbon dioxide produced by mankind. Is that science? Anyone who demurs is classed as a 'denialist' or as the British PM put it 'Anti science and a flat Earther'. Is that the scientific way of doing things?
All this would be fine if the argument was over something more esoteric like 'Dark Matter' or 'gaseous nebula' near Omicron Persei 8. But this isn't an isolated scientific argument. AGW means massive changes in how the people of the whole world live their lives. Massive social changes and loss of freedoms we now take for granted. It's already happening. Like all of us, it costs me extra money every day. People have already and continue to die because of changes made in the light of AGW theories.
This cannot be treated like many other scientific discussion or theory. The science must withstand every test thrown at it. So far it hasn't. You are right about one thing. It's all about the science or it should be. The fact that it isn't is a failure of the scientists involved. Excuses about being poor at public relations doesn't cut it.
The onus is on the scientists to prove this, not on the skeptics like me.