Your reply is reasonable. I've always thought the biggest problem to almost anything is human. We sometimes make the most thoughtless decisions and justify them with the flimsiest of excuses. We marvel at the stubbornness of two year-olds, then ignore ourselves.
> I've always thought the biggest problem to almost anything is human.
Makes sense, "problem" is a human invention and without humans on the planet, there wouldn't really be any problems anymore.