Here's why:
* Subjectivity: An article that expresses opinion is inherently subjective. It presents a particular point of view and may not be based on neutral or objective facts.
* Lack of Objectivity: Bias often arises from a lack of objectivity. Instead of presenting a balanced view, a biased article leans heavily towards a specific perspective, potentially excluding opposing viewpoints or downplaying conflicting information.
Important Note: Not all opinions are inherently biased. A well-written opinion piece can acknowledge different perspectives and present arguments in a fair and balanced way. However, when an article leans heavily towards a specific point of view without acknowledging alternative perspectives, it's likely exhibiting bias.