Why was the theory of natural selection criticised?

Answer 1

Natural selection would also destroy the species because sometimes it also leads to some harmful effects of the species.

E.g : if in a population of red beetles a green beetle arises,the green beetle would multiply in number as they are not identified by the crows as the colour of the bushes in which the beetles live and the colour of the beetle would be same.whereas the red beetles would be eaten by the crows and so the beetles population would reduce.