Insect eyes as a whole aren’t great. They’re small and better at detect contrasts/edges/light changes than fine detail. Which works out great for them in the natural world.
But glass windows aren’t natural. There’s no capability in their microscopic brains to discern that the reflections and slight color distortion from a glass window indicates that an object is there. The lack the capacity to know that. And since they have no ability to know something is there, they default to thinking the way is clear because light shines through – despite having just collided with the window.
Keep in mind that flies have been known to pull their own heads off by accident. These are animals operating more akin to a computer than a conscious, sentient being. Their entire behavior set is based on instinct, and that instinct does not account for windows.
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