This page documents a Wikidata policy. It is a widely accepted standard that all editors should normally follow. All changes made to it (except for minor edits such as fixing typos) should reflect consensus. When in doubt, discuss your idea on the project chat.
This page in a nutshell:
Unless there is clear evidence to the contrary, assume that people who work on the project are trying to help it, not hurt it.
If criticism is needed, discuss editors' actions, but avoid accusing others of harmful motives without clear evidence.
Assuming good faith is a fundamental principle on Wikidata. It is the assumption that editors' edits and comments are made in good faith. Most people try to help the project, not hurt it. If this were untrue, a project like Wikidata would be doomed from the beginning. This guideline does not require that editors continue to assume good faith in the presence of obvious evidence to the contrary (vandalism). Assuming good faith does not prohibit discussion and criticism. Rather, editors should not attribute the actions being criticized to malice unless there is specific evidence of malice.