That makes many guesses and questions, and not so naive for a layman.
First, this is indeed a copula of winged reproductives of the same species as the workers, i.e. the Florida Harvester Ant (Pogonomyrmex badius).
Second, the small black alates with yellow-orange gaster are indeed the males, while the females are the same color as the workers.
As for the surrounding workers, they simply should not be there - or this copula should not have landed there, which amounts to the same. Because the workers do all but helping; instead, they treat both members of the copula as foes.
While her strength would allow the female to escape (despite being indeed fiercely pursued by a - fortunately for her - much smaller worker, the male is obviously doomed to be recycled as food for the brood of this one nest.
The white exsudate on tip of the females' gaster is what is left from the semen of this and several previous male partners.