So then are there just no organizations other than government that can get done what you want? Why advocate for higher taxes rather than upping your voluntary contributions?

I just listened to this [0] Sam Harris podcast episode yesterday so it's kind of on my mind, though this is admittedly a tangential issue to the podcast.

[0]: https://www.youtube.com/watch?v=PxStuUxaZxQ&t=4171s