Kickstarter should promote the trust of backers in a similar fashion to the way that Ebay promotes the trust of purchasers. Kickstarter should be seeking to increase accountability in any way that it can through reputation systems, project completion metrics, background checks, and full transparency of the entire process.
Besides the sad response to the Arduino founder in this article, I would point to the backer-only forums and updates on each Kickstarter project. How are potential donors to see what's going on in that project?