I disagree. Maybe you've worked in more efficient government agencies, but I've worked in both sides and the private industry groups Ive worked with arent perfect but are massively more efficient.

Or perhaps you have just worked for more efficient private industry groups.

There is waste in private enterprise to be sure. The key difference is that that mostly punishes people who voluntarily invested and can choose to stop investing if they get fed up with it. That's (practically?) not at all the case in terms of federal government waste.

What makes that the key difference? Doesn’t it depend on what you care about?

The voluntary part is the key difference from a libertarian perspective, but it is not the most important bit if your goal is to, say, minimize suffering for the worst off in society.