I can't, but Noam Chomsky says he can:
The interest of linguists, as linguists, in universal language was based on an illusion, which linguists had but no longer
have. That was the illusion that Esperanto is a language, and it isn’t. Yeah, Esperanto has a couple of hints that people who know language can use based on their own linguistic knowledge to make a language out of it, but nobody can tell
you what the rules of Esperanto are. If they could tell you that, they could tell you what the rules of Spanish are, and that turns out to be an extremely hard problem, a hard problem of the sciences, to find out what’s really in the head of a Spanish
speaker that enables them to speak and understand and think the way they do. That’s a problem at the edge of science. I mean, a Spanish speaker knows it intuitively, but that doesn’t help. I mean, a desert ant knows how to navigate, but that doesn’t help the insect scientist. You got to figure out what the ant is doing, and it’s now understood that that’s an extremely hard problem. You go back a generation or two, it was considered a trivial problem because of lack of
understanding of the nature of language. To take a kind of analogue, if you go back to pre-Galilean times, there’s no problem about why if I let this go, it’s going to fall to the ground. It’s going to its natural place. What else is there to say? Well, it turned out that there was a lot to say. To be puzzled by simple questions is a very hard step, and it’s the first step in science, really. And the same is true about the
nature of Esperanto, or Spanish, on which it’s based, and so on. We don’t know the answers to the questions of what the principles of Esperanto do because if we did, we would know the answer to how language works, and that’s much harder than knowing how a desert ant navigates, which is hard enough. So, now it is understood that Esperanto is not a language. It’s just parasitic on other languages.
(Chomsky On Linguistics, Mark Aronoff, Department of Linguistics, Stony Brook University, March 2003)
There you have the argument of Noam Chomsky. And now, spanish speaking desert ants, please tell me: do you agree?