To be more specific, it shot down a balloon from a hobby balloon club, which is built similar to a child’s balloon insofar as it has the same material.
On the heels of the Chinese balloon incursion it might be understandable why they would shoot down a high altitude balloon.
The same military used a 6 figure missile to shoot down a children's balloon https://www.npr.org/2023/02/18/1158048921/pico-balloon-k9yo