I don't think Kimberly-Clark ever opetated a concert hall, but they did run an airline (Midwest Express) and K-C Aviation was an airplane servicing firm.
It's not that American companies don't operate in diverse businesses. Maybe they're less likely to, but it happens when the need arises... if there's no reasonable supplier for an important input, then you start one, or you ask an existing supplier if they can start a new line of business that's somewhat related.
The headline example is that Toto, known as a maker of ceramic toliets, is making a lot of money making specialty ceramics used in semiconductor manufacturing. Which yeah, ceramic manufacturer makes ceramics.
The US business market does like to spin-off divisions when they are successful and can be independent.