This is somewhat inaccurate. Bilbo is actually Frodo's cousin (on both sides), but Frodo refers to him as uncle. Frodo is also a very young adult when Bilbo gives him the ring, since hobbits reach the age of majority at 33. It was akin to Bilbo handing off the ring on Frodo's 18th birthday, if they were humans, so while it's true that Frodo hadn't been exposed to the world that much, it's really due to him being a child before he got the ring.

I disagree. Love might not be the ONLY driving force, but it is a big one. You can't have the adventures and excitement without love. The crew all love each other, in a way that only a group of people in a military (because exploratory purpose aside, Starfleet is a military) stuck on a starship together can. They're friends, they're family. That love was the driving force of many episodes of the original series. In the Wrath of Khan, it was ultimately Spock's love for his crew that drove him to sacrifice himself (logical or not.) In the Search for Spock, it was Kirk and his crew's love for Spock that drove them to give up their careers, their ship, and very nearly their lives, just for a chance to bring their friend home. In the Voyage Home, the MAIN plot was a group of friends working together to save the world. Yes, there was time travel. Yes, there were whales. There was also a large portion of the story dedicated to Spock's memories and his relationship with his friends. Star Trek wouldn't be Star Trek without love.