I noticed that too and it doesn't really make any sense to me. A LE character is not hidebound to always do LE things, surely. That would mean that alignment shift is not an option (and yet it CLEARLY IS in PF:K and in every other game I've ever played that was at least tangentially related to D&D). To say "you're LE you can't choose a Neutral dialog option" just puts cart before horse, as if to say "You are your alignment first and a thinking being second". And yet as a NG character I could choose dialog options at the settlement that WERE NOT NG in nature. It not only makes no sense in the context of the game system it's not even consistent WITHIN THE GAME ITSELF.
I agree, and even besides all this, I see a lawful evil character as someone who would happily broker peace between two factions (restore the law and order) for personal benefit (a peaceful kingdom would confer personal benefits). The 'evil' should've been reconciled thorough the method of brokering said peace (kill all the leaders and force them into it!), not by thinking that the entire thing is only something a 'neutral' person would do, effectively locking out so many other allignments.
ngl, i find this game incredibly childish. Everything from the style of the writing to the cartoony characters and basic interpretation of good and evil makes me think this game's been made for children. I know that's not the case considering that the subject matter can be mature as well, and even well done in some cases. I just don't know how they can even make such arbitrary choices that result in locking options behind alignments.