The topic is related to the quality of science. Science is composed of scientists.

>Do these people define what science or is it an established set of principles and methods?

Science is defined by the actions and output of the entire system.

Perceptions of science, your beliefs (perceived as knowledge) are affected by how scientists (and their fan base) define "it".

> You think scientists are the only ones who can do science

No.

> and what they do, wrong or not, defines what science is??

Yes. If you think otherwise, I would really like you to walk me through your reasoning.