I don't see why vetting would put any more liability on Kickstarter - all the 'responsibility lies with the creator' legal mumbo-jumbo can remain in place.
If you browse this thread you'll find lots of suggestions from different people. Probably other people will have better ideas than mine, but for what it's worth: I'd require projects successfully raising a large amount (say, more than the price of a midsized car) for hardware to agree a series of milestones, releasing the funds to them in stages. The precise milestones would be agreed on a project-by-project basis, but could include: Some money up front, some money when they have a preliminary electrical schematic and prototype on breadboard, some money when they have a costed bill of materials and a final prototype, some money when they have a feature-complete mobile app, and some money as the products start shipping and the invoices from manufacturers start arriving.
To put it another way, creators can't have any pudding if they don't eat their meat.