Ten to fifteen years ago, Wikipedia, though not free of bias, seemed like a rather reliable place to find information about people, places, and events involved in modern politics. Someone desiring to research something related to current events could back then often be well served by starting with a look through a page at Wikipedia.
But, over time, the reliability of information at Wikipedia has declined. Efforts toward objectivity have increasingly been replaced by efforts toward bias. Wikipedia has increasingly become, especially in areas related to ongoing political matters, polemical.