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In the US, the whole higher education system is designed to extract the most money possible from students. Packing them into a shared room and charging them the same cost helps to effectuate this goal.
I’m in the UK and when I went to uni all of our rooms were our own but I had a friend that went to a different uni still in the UK and had to share in her first year. She hated it so much there was no privacy and her work suffered a lot from it >

living with another person is a learning experience. college is a learning experience. >

I get where you are coming from, but I personally can't be bothered to care. Like, sure  someone once had sex in the upper bunk bed, which objectively isn't a nice move, but whatevs >

It keeps the cost of student housing low. If each dorm had separated walls like an apt, they would make students pay for them like an apt. >

I liked having a roommate. It’s a built in friend. I never found it weird.