The weight of an object is equally proportional to the force it exerts when faced with gravity. Little weight, little impact.
Also, what you may think is effortless pressure from you index finger is actually a lot of force and weight in comparison to the bug. Consider this, have you ever rear ended another car at 0 miles/h? The force is jarring isn't it? That's because you never anticipated that such slow movement would generate that much force.
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