Why would a historian find this to be a biased source of information?

First, historians sometimes misinterpret evidence, so that they are not justified in asserting that the inferences they draw about what happened in the past are true. ... They are only biased if they occur because the historian wants the outcome she has produced, normally to further certain interests that she has.

Explanation:

syria

tens of thousands of people were killed in as it’s longtime leader attempted to stay in power.