Libraries are funded by the tax payer and as such have no expectation to make money - they simply operate within the budget they are given.

A charity or a non-profit organisation is funded by donors. Non-profit doesn't mean 'loss making', it means that all of the money is re-invested in the organisation to support it as a going concern, rather than paying it all out to shareholders or, in the case of PP, re-donating it to their community.

So it's perfectly reasonable to want such an organisation to be, well, financially sound. That way it can continue to make the impact it does, or even increase that impact through growth.

If that doesn't happen then you haven't donated to support a sustainable mission, you simply funded a one-off project. In any other situation this would be seen as catastrophic mismanagement and there'd be some accountability for it.