I don’t think you looked very hard—I turned up a few books apparently on moral philosophy by searching in Google Books for ‘moral (“lotus eating” OR “lotus-eating” OR “lotus eater” OR “lotus-eater”)’.
And yes, I’m pretty sure the wirehead term comes from Niven’s Known Space. I’ve never seen any other origin discussed.
I don’t think you looked very hard—I turned up a few books apparently on moral philosophy by searching in Google Books for ‘moral (“lotus eating” OR “lotus-eating” OR “lotus eater” OR “lotus-eater”)’.
And yes, I’m pretty sure the wirehead term comes from Niven’s Known Space. I’ve never seen any other origin discussed.