Project- "an individual or collaborative enterprise that is carefully planned and designed to achieve a particular aim." What is the Particular aim you might ask, ah yes a product that we will have access to after the planning stages... The people who pledged are pledging towards a project that promises a product, The Majority of Patrons are pledging for the Product, its a transaction, not giving purely because we think its a cool idea...

I would agree with you, but people paid for a product, The devs do not do this out of the kindness of their hearts or for charity, this is all for monetary gain. People invested in the product and had expectations, and they were not met... They have the right to be mad.