> It's not tax payer money, it's spacex's money.

Some US$ 18 billion came from tax payer though.

Right, but they only received that money by delivering completed milestones and missions. They didn't get money to blow things up with no results.

When McDonalds spends money, do you complain they are spending your money?

US government paid SpaceX for services rendered. It's economy 101.

If I have agency over the spending of course I won't complain, when tax money is allocated then I'm feel pretty free to complain :) I don't live in the USA though so don't have a horse in the race.

And it was better spent at SpaceX than the usual cost plus defense industry players.

What's the difference between SpaceX and all the other big US space companies?

They all receive government contracts/investment/subsidies (or whatever you want to call it). Why is this specific company being singled out?

% of income attributable to the public coffers.

That money is from selling goods and services to the government on a commercial market.

You do understand that private companies wish to get paid for goods and services provided to the govt?