i think its a little incongruous how people are much more open to the idea of pure science research, or math research, than the equivalent in music or art. both cases can yield untold benefits down the line.
By the way, at least in my country (Austria) the government also spends money on artists, though I will admit that I am not aware of how big that part of the budget is. Most likely smaller than R&D though.
But in general most people also indirectly fund these things. Want a better camera in your phone? For that you will need better sensors, for that you need better factories, etc. At some point you reach the mathematicians or other scientists that are somewhat far removed from the product.