"We're Going Home..."
It is safe to say that Cooper retained all of his previous knowledge of the events on 02/23/1989 because:
1. He solved the murder.
2. He asked to be placed there that night to save Laura from her Fate.
So WHY on earth would he take her home to a murdering, raping Father?
Guess what? Bob would still be alive and well inside of Leland if you go back to a time before he left Leland's body.
It's simple time travel 101...
Fair enough. I have my moments of anger still from time to time. But I've processed it a bit and with the wonderful insights and debates among my forum kin, I've come to accept it as it is, not as I want it to be. I can have fun with it now.
Of course, I still haven't researched the entire season. Who k owe what emotional state that might bring.