The white flag of surrender with a faded image of Old Glory in the background doesn’t seem like a lame message to me..
Imagine if more of these start to pop up at various national landmarks....
But it’s not at all obvious to me (and I assume most others) what it means.
Is this somebody from our side showing how that the fedgov has surrendered as far as illegal immigration? That (with the bridge context) is what I’d take it to be.