Shouldn't be in the Reality, Real-World Connections and the Supernatural forum?
I don't think you can compare Humanity to Lavos. Comparing humans to Lavos shows an incredible amount of self-hate.
Yes and no. It is, maybe, a warning, which is quite a common thread in such games, I think, and (from what I've seen) in Japanese media as a whole. Most of the Miyazaki films seem to deal with that on some level.
However, the implication is that humanity is not evil, but simply bad. Bad in action, thoughtless in the way we behave, corrupt due to our sin (which, in the Chrono world, is an effect of our being the 'children' of Lavos... or so say the Dragons, at any rate.) After all, it is humanity that saves the world time and again. It is only, well, a certain measure of arrogance and lethargy that is attempting to be portrayed. The extinction of creatures is shown through the Hydra and the like, and the game-writers are, through the voice of the Fairies and the earth, are saying: stop the hate, think about the planet, and not yourselves for a moment. Thing about the cost. It's a typical enviromentalist message and, though it's a touch idealistic, is not without its merits. It is certain that things could not change in a short space of time, but the fact of the matter, most of the enviromental problems we're facing are not the ancient crime of humanity: they're the side-effect of a giant leap in our progress. The world was exceedingly exploited through the Industrial Revolution and beyond, with no knowledge nor care for the effects. Well, that's done and past. Time to shape up and change, and atone for that. Not continue in our ways (for which we must be seen as enemies to the planet), but make things better. Like I said, idealistic in the short term, but not impossible. There is also a second reason for it is rather more philisophical, and this ties in better with the whole idea of Humanity=Lavos. I'm not thinking too well on this regard right now (someone fill in for me), but this is more along the lines of inherent nature. A wish to destroy, a wish to command, and grow, and, as Kid says it on seeing Terra Tower 'to become more powerful'. It's a philisophical analysis of what makes humanity different from the animals. I forget who said it, Greek or Roman, but something along the lines of the fact that it is humanity, alone of creatures, who look up to heaven, but even so we cannot grasp eternity. That's one explanation. There are a myriad of others in a hundred cultures. What the Chrono writers are saying is seems, above all else, to be an anomoly. Now, that's worked out for good in the past, but we must watch it, else we turn out like Lavos! And, in fact, we often behave so much like him, let's make them akin in this story. There's that potential in mankind to become like Lavos - see the Queen of Zeal and her misguided ambition - but I do not think the philisophical idea in Chrono, as much as hatred is spewed by the earth, is that mankind is evil. Flawed, but capable of great things. Destructive, yet saviours. Sort of standing a foot upon either shore - an anomoly to both, as it were - and capable of going either way.
Essentially, I think the message of the game (if I read it right), is that humanity, as we're behaving, are Lavos. However, we have the potential to be better. In other words, on one hand we have Lavos, and on the other the Reptites. Well, we could do with going over to the latter side a little more. Unless I misread the intent, however.