Spock's more concerned with setting up housekeeping with the population of a small town. How many millions or billions is he putting at risk?
Yep, the other thread got locked, but this is the other half of narrative elephant sitting in the middle of the writer's room. It's not a big deal, but it's amazing how we all feel compelled to deny that these stories even have the tiny or common flaws.
I think the last film was OK, but they did kind of write themselves into a spoiler/power-corner by keeping around a guy who has seen the next hundred years or so. No doubt they didn't kill him, just in case they wanted to insert another cameo, but it would have been better to axe Old Spock (Spock is dead long live nu-Spock!) to avoid these questions. Or better yet, they shouldn't have worried about the soft-reboot and sale-pitch and just started a new TOS story at year-one without importing Old Trek baggage. A clean break should be clean.