Why send your child to one of the "most rigorous colleges" in the US but not highly ranked?

Many kids in STEM simply realize the limitations of science classes and pursuing un-related fields in college, either as additional majors or minors. I am talking about Art, Music, Language, whatever else. They are claiming that it gives them an edge in science classes, ability to see a different solution, in addition to providing great R&R for somebody who is just not used to have R&R in front of TV.