Yeah, as non American, only indirect way I can contribute to NASA is to buy some official merch, but I would not mind throwing some $ to sustain/extend some ongoing programs operation costs.
Throwing money at government agencies is an exercise in futility. Trust us Americans, we do it every year in the form of taxes, and things aren't getting better.
It's not just a Republican talking point. The hem and haw of taxes from left to right, (just enough to keep the same two parties taking turns every election) for the past 50 years leaves both parties complicit.
Cutting taxes on a broken tax system that disproportionately taxes poor and middle class citizens does absolutely nothing positive for the vast majority of the electorate in the long term. Neither does the reciprocal raising of taxes once the other side jumps in the drivers seat.
Also, please refrain from suggesting posters are "parroting" arguments. It's an argument that doesn't really contribute anything to the discussion, and isn't in the spirit of HN guidelines.