I know that Magus wouldn't stop them, because he didn't knew that Zeal would fall... He even tells you something like "no history book could have prepared me for what happened here" when you find him in North Cape.

And Crono did what he could to stop the Queen and Dalton, but he was a little too late to do anything.

I'd say that was their fate. Everyone in Zeal (besides Schala and the gurus) thought that Lavos' power was a good thing, and that power would improve their society...