What is this effect called?

[btb]

I feel like I've seen so many fitting examples of this curve in all types of different topics, why is this such a common thing?

 

[btb]

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[btb]

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[Aryan Incel]

Dunning Kruger effect I think

 

[finnishchin1]

Its a bell curve twin it aint that deep

 

[Tttopgtoni]

View attachment 4546887

I feel like I've seen so many fitting examples of this curve in all types of different topics, why is this such a common thing?

I think it's the bell curve