I have no sympathy for the people who put money into this and lost it all.
After even the most basic investigation into the state of play regarding quadcopters, you would spot the fact that the Zano uses very simple brushed motors and propellers from a toy quadcopter. Just knowing enough to recognise the kind of technology they were planning to use would tell you that the project's goals were unrealistic.
Caveat emptor, fools are easily parted, etc etc.
I don't think Kickstarter is particularly at fault. Surely it's the investor's responsibility to exercise due diligence?