While notable minority opinions are welcome when verifiable through reliable sources , and constructive editors occasionally make mistakes , sometimes a Wikipedia editor creates long-term problems by persistently editing a page or set of pages with information which is not verifiable through reliable sources or insisting on giving undue weight to a minority view .
While different viewpoints are welcome when verifiable through reliable sources , and constructive users occasionally make mistakes , sometimes a Wikipedia user creates long-term problems by persistently changing a page or set of pages with information which is not verifiable through reliable sources or insisting on giving too much importance to a view that is not held by most people .