"Europe" does not have a unified stance on this, don't paint our entire continent as The Borg.

If you are Dutch, just take a one-hour flight to Copenhagen to see how a city can be absolutely plastered with national flags.

If Poland or France were introducing a new nationally produced rocket, they would certainly show their national flags around it as well. They definitely do so when displaying new weapons. So does Ukraine etc.

Accidentally, I remember the Dutch colors on every package of Dutch cheese I ever bought.

The flag has been coopted as a symbol of right wing nationalist politics. It's the easiest way to identify the right - their very strange love of the flag.

Almost any average factory floor in the U.S. has an American flag hanging somewhere. Sorry Europe doesn't have any pride in itself!