Holding your breath til you trun blue does not make your assertion true.
Theories about how things work are not prescriptive.
At best (or worst) they enable us to do things we would not be able to do without them.
But humans were causing extinctions long before Darwin, and will continue doing so.
OK so to you it is humans. Care to explain how most species ever to live on Earth went extinct before the species Homo ever existed.