Why does the scientific establishment sometimes reject new ideas?

The correct answer will be- new ideas can contradict as well as challenge the accepted theory.

Explanation:

Science is a way or producing new knowledge where scientists assume that with few assumptions they can understand the patterns of nature.

If one idea is believed to be true then it is very difficult for humans to accept new ideas as resistant to new ideas is the characteristic of a human.

The new ideas can contradict as well as can challenge the existed theories so humans modify the main idea rather than rejecting the accepted idea.

Thus, new ideas can contradict as well as challenge the accepted theory is the correct answer.

equal distribution i think.