I choose to recognize that I'm watching a film and TV franchise, one that's never ever had a good track record for internal consistency. The points I listed were just the first off the top of my head. There are several websites detailing many, many more.
You can argue that Spock's behaviour is totally out of character, but with the exception of TNG's "Unification" two-parter, we haven't seen or heard from Spock since Star Trek VI. You can't tell me that he wouldn't change a little in a hundred years, especially if you count smiling Spock from "The Cage" in the same continuity as the rest of TOS.
I'm going with that answer, too.
You can have the whole thing any way you want. The arguments and theories (which tend to make me very, very sleepy) can go either way.