Our objective should be to help people understand why it's impossible for congress (government planners) to know the optimal level of funding that any organization should receive.
Why is it impossible? Because if it were possible...then we wouldn't need markets. Markets work because all our spending decisions determine exactly how much funding an organization should receive. Therefore, the problem with the public sector is that taxpayers are not the ones making the spending decisions...a small group of government planners are making the spending decisions for them.
So rather than trying to argue over whether something should...or shouldn't be...a public good...we should simply argue that taxpayers be given the option to directly allocate their taxes. This will force the opposition to come up with new counter arguments.
We've been attacking liberals from the same exact direction for the past 300 years...so they've built up their fortifications accordingly. It's time we attack from a completely new direction. What arguments will they make to defend congress? Will they argue that congress is so superior? Will they argue that taxpayers are too stupid?