There are many ways to show Hakaras HaTov to America w/o singing a song. According to your logic, every workplace and workday should start with a song?? Do your childrens’ school say this every day?
The various speakers (even Rabbonim) mentioned America and thanked the state and all local enforcement on hand many times for this event.
Instead of having HaTikvah, they had Rav Lau speak to recognize Israel. Or better to sing a song?
Or maybe they should have served Turkey at the Siyum HaShas? That’s the national food of thanks!
How much nonsense can people spew and then darshan over and over?? What, we ran out of ways to solve the shidduch crisis? 🙂