I am not making a slippery slope argument. Comparisons between the shuttle program and the national debt are real, not some absurd hypothetical I've dreamed up that I think exists down some sort of slope with poor traction.

The point I am making is that price comparisons between unlike things are worthless.

If you prefer, here is an entire HN discussion on the problem of price comparisons between unlike things: https://news.ycombinator.com/item?id=4393817

But "compare to completely unrelated thing" is also a logical fallacy.

This is your friendly reminder that jlgreco's is not a deductive argument and that most of the logic we base our everyday decisions on would be called logical fallacies. It's time for a Fallacy Fallacy, I think.

This is also your friendly reminder that jlgreco wasn't even employing "slippery slope" logic. He wasn't arguing that employing a cost comparison will lead inevitably to employing further cost comparisons. He simply pointed out that one cherry-picks the level that best makes one's argument.

This is your friendly reminder that your post makes no sense.