I have to say, I love PBS/NPR, and donate every year. It comprises at least 50% of my TV time. I also admit the leftist bias of the organization, but I keep in mind that saying about needing both wings for the eagle to fly.
I also believe that federal funding for legitimate research purposes is necessary. All the funding for LGBTQ agendas etc. is nonsense, in my opinion, but there are some things that are too large for private equity to handle.
Note that Big Pharma's claims to needing exorbitant prices for research that is already fully funded by federal funding should be examined and dealt with as fraud when the occasion arises.
At any rate, in addition to Shawn's listings above there is customs regulation, national law enforcement and the sadly needed federal correctional facilities that should NEVER be in the hands of private equity. Border regulation, air space management etc. need to be handled. Emergency management on a federal scale needs funding.
Lastly, education. The ties to Left / Right agendas need to be closely monitored and usually removed, but, again, some things are too big and too important to be left out. There's probably more, but this is what comes to my mind in an instant.
Of course, these are simply the opinions of one individual schmo in rural Tennessee, but this schmo had to voice his opinion.
I think a good percentage of people are on the "what's in it for me" side rather than on the "what do you need" side. Moderation is a good balance of both of those. YMMV.