The Kickstarter haters are out in full force today. Quite frankly, we all knew the risks when we bought into DF Adventure, or any other Kickstarter for that fact, so I don't see how there's any "Stockholm syndrome" or any other crap. Even Tim said that they would be documenting the experience so we could either see the development of a successful game from start to finish, or watch the trainwreck from the very beginning. That possibility was always there, and I feel it was communicated appropriately.
As for the matter at hand...
The way I see it, we get a more complete game if this is split in two as DF have proposed. As backers, we're not really getting half a game (DF are just letting some non-backers get in a bit earlier to help finish off the other half, which we're getting as part of the initial $15 we paid), and we knew this would be a long time coming since they had to start from scratch. Comparing this to a game announcement plus copious delays reaching up to two years is intellectually dishonest, since a lot of games are announced when they're well into development. With Broken Age, we watched the process from before a single line of code was written.
I've edited numbers into your post to address each of your points.
1) The extra money allowed them to spend more time on the game, thus the scope increased. Tim was too ambitious, and nobody is letting him get a free pass for that (the criticism is justified), but the implication of your post is that they shouldn't be paying themselves a salary to make the game? What? What else would they spend the money on? The whole point of Kickstarter is to afford these people the money to work on the project full time. The more money they get, the more time they can spend on it, thus the bigger the scope of the project.
2) I don't see how you can't fathom what went on here. The scope of the project increased and they needed more money to pay for the development time. It's pretty simple, really. The original DF Adventure was going to take less than a year and be a really low-budget thing. The success of the Kickstarter meant Tim felt he could make a bigger game with higher production values. Obviously they've been overambitious, but the implication that something shady happened, and that they've embezzled the funds or something is pretty gross. Take that shit elsewhere.
3) Then don't back anything on Kickstarter. We all knew the risks going in...
4) Games are expensive.