There is more to “the University mission” than academia, just like there’s more to a college education than getting a business/engineering/economics/hard sciences degree.
Your second statement is true, but I question your understanding of academia given the entire context of this conversation. Burrito is also correct that you are making giant leaps of logic throughout the discussion.
There's part of "college" that really is nothing more than being young and not living with your parents anymore. People who don't go to college experience similar social growth when they are that same age. That's not "college," it's "being human in an advanced society." As
@Medford M. points out, other societies don't view those social experiences and that part of growing up as a necessarily "college experience," but rather it's just a "life experience."
It's interesting to me that you are the one who assumed when I wrote "further science and our understanding of the world" that you assumed I only mean "business/engineering/economic/hard sciences." I think that says a lot more about you than it says about the argument at hand - it's also why I started this post chiding you about your understanding of academia.
I didn't think I needed to be explicit that expanding our understanding of the world includes "liberal arts" things like art, history, music, etc - but apparently I did.
Things can be silly. Things can be fun. Things can be stupid, and silly, and fun.
And... they can be stupid, silly, fun and important.
I get the argument that participation in sports teaches a lot of valuable life skills. But we all don't participate, and I have yet to learn a really valuable life skill by watching and cheering other people while they play a game.
But I can enjoy being part of a crowd, and I can enjoy connecting and bonding with friends and strangers.
There is no really good reason why that needs to be so closely tied to being a "college" experience.
In some ways, I could even argue that it's detrimental to the university mission. (Argument below: note, I'm not sure how much of this I buy, but it's definitely something to think about):
Put a bunch of twenty year olds in a mid or large size city. That city will create entertainment options for those kids, even if the university does not (note: this happens everywhere else in the world).
Now, when those 20 year olds go to the concerts, or sporting events, or whatever - instead of being surrounded with 90% of the kids going to the same school from similar social and economic backgrounds, they'll be there with all the kids from different backgrounds - you know, all the kids who don't go to college. Now, we're really talking about creating connections and bonds that bridge real differences.
When I talk to people who attended "uni" in other parts of the world, they'll talk about how while they were there they went to the local soccer club's games, or got into the <insert some genre of music> scene - and it's amazing how many times they'll talk about becoming regulars at some local watering hole where fans of that music/team whatever generally hang out, places where they ended up socially interacting with plumbers, trash haulers, mechanics, hair dressers, cleaning folks, etc. They were the same age, enjoyed the same music/team, and they spent this time in their life hanging out together. Then I compare that to the "college experience" of many American students, and well...