There should be a cartoon, or maybe a photo essay

showing "peaceful, constructive demonstrators"
as (photos from Ferguson MO, Baltimore MD,
Occupy Wall Street, "Black Lives Matter" etc.)

and then "radical, dangerous right wing extremists"
as (photos of an audience at a tea party rally,
grandmas baking pies, gardening, etc.)

The best and surest sign that this site was where a Tea Party gathering occurred?

It got left cleaner than before they got there.