Well, there are definitely several strategies out there for denying climate change:

1. There is no long term global warming. We've already plateaued and cooling is about to set in.
2. Global warming is part of the natural cycle. Nothing we can do about, even if we wanted to. How arrogant we must be to think we can change nature?
3. Global warming will be good for us.
4. It's too expensive to fix.

And, of course, sometimes they like to use multiple of these at the same time.

The bottom line of the article:

The one message that comes out of this is the world has to adapt and the world has to mitigate,” said Pachauri.

At least that saves me having to read all 2600 pages of the 32-volume report.

Without having read the Koch report either, from what you have said and the excerpts you quoted, it sounds like both are saying Climate Change is a given and we have to learn to live with it. One report says look at all the good things that might happen; the other says look at all the horrible things that will happen. Human nature being what it is, is it really surprising that some people prefer to be hopeful?

Not that prophets of doom are never useful. Sometimes they can scare enough people into changing their ways and avoid doom but then they are disbelieved retroactively.

Timing of prophecies is important as well.  Too soon and too much harping will tend to make people tune out. Too late and then efforts would be better directed at figuring out what to do after the event, assuming there is an after.

Just musing. I am not a doubter but I do wish the conversation would move on from the 'is not' versus the 'is too' stage.