They could go anywhere else but those places don’t have what they are looking for. What they are looking for is hot insect booty; it might not look to you as if they are doing anything in particular but you can barely see them at all. Much like people crowding a night club their odds of finding a mate are much better when grouped than if they all randomly wandered.
If there’s something in that spot that draws one, it’ll draw any others in the area depending on the senses of the insect and the strength of the thing drawing them.
If it’s a warmer patch of air, they follow the gradient; heading in the direction where the air is warmer until they’re in a patch where there is no air warner than there (near them). Or replace warmth with light. Or pheromones. Or a smell that means food. A bunch of insects in an area following the same stimuli will naturally converge in the same area.
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