The white wizards after the fall of Fairhaven seem to be more evil and the world as a whole seems less safe. Is that true or is that just my impression? Either way, do you think Justen was right to destroy Fairhaven?

I don’t see the world of Recluce as less “safe” after the fall of Fairhaven. Had Justen not destroyed Fairhaven, even more of Candar would have suffered the ills that Fairhaven was perpetrating on Sarronnyn. The choice, in effect, was between evil concentrated by Fairhaven and dispersed evil from mages using chaos to their own personal ends. Empires often create stability or the illusion of stability, which people accept in place of uncertainty.