I always find Lavey's commentary on society interesting; both the way society currently is, and how he would like to see it changed.

I especially like seeing his views not directly related to Satanism as a religion itself, but rather on social relations between people, government, family etc.

Would there be a specific book where Dr. Lavey has a lot more of this commentary, (I would very much like to read more about his eugenics ideas) or at least a free (legal) source online?

Thank you!
(Also yes I know many of his personal views are not official COS doctrine, nor is Satanism of course setting out to change the world...anymore than the specific worlds of each member, as they wish in accordance with the religion.)

What books by him do you already have?

The Satanic Bible and The Satanic Witch.

I always want to read more though!

These two are currently available:

"Satan Speaks!" and "The Devil's Notebook".

Thank you Magister; I'll look into them!

Those hadn't been as high priority for me to get as Witch and Rituals, but I'll check them out now.