They know that NASCAR is one of the few sports running live, so it's natural that someone would target it for the negative publicity. They'd do it to the PGA, too, except that pro golf is a much more exclusive event that takes place in locales inaccessible to ANTIFA thugs.
-PJ
1.) Person did it themselves
2.) Done by provocateurs on the Left
3.)Racist interpretations of every day events
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99.) Conservative racists wearing MAGA hats