Not at all: complain about it all you want, and make your decisions in accordance with your understanding of the relevant risks.
Just recognize that a certain level of risk - in the form of possible breaches of promises - is inherent in the nature of all of these things - traditional investment, pre-orders, and Kickstarter alike - and that there's no way to pre-empt that downside without eschewing the upside.
With a traditional pre-order I have a pretty strong guarantee from my credit card company. With a traditional investment I take on the risk in return for a chance of a big gain. As a client/customer Kickstarter seems to combine the disadvantages of both with the advantages of neither.
Just recognize that a certain level of risk - in the form of possible breaches of promises - is inherent in the nature of all of these things - traditional investment, pre-orders, and Kickstarter alike - and that there's no way to pre-empt that downside without eschewing the upside.