Originally posted by The_Tempest
According to Lucas's ROTS commentary and The Revenge of the Sith Visual Dictionary, Palpatine's "peace" and shit were apparently genuine.I choose to interpret it as you did: a line of bullshit fed to Anakin in order to complete his transformation.
I don't remember what the ROTS Dictionary said, but I kinda remember the commentary, and I believe Lucas said something along the lines of "Palpatine claims he wanted peace, which might be true, but the cost of it was too much." So I always took that as Lucas trying to get the audience to look at it from what may have been Anakin's perspective, hence the word "might." Also, IIRC, in the featurette, Becoming Sidious, Lucas says Palpatine represents the devil, being pure evil and is only in it for power.
Either Lucas was interpreting his commentary statement from may have been Anakin's POV, or there seems to be a contradiction, which wouldn't be surprising.
Edit: found it.
It's towards the beginning at about 0:38.