There's no shame in failing if you haven't taken your customers' money. "Kickstarter" is not synonymous with "give us your money and we'll try really hard, but if we fail, bummer for you".
Kickstarter backers are not customers. They are speculators. There may be shame in failing one's customers, but not speculators. Kickstarter backers know (or should) that any backed venture can fail.