Final answer:
The viewpoint of the historians described above can be best explained by personal biases.
Step-by-step explanation:
The viewpoint of the historians described above can be best explained by the fact that historians are influenced by personal biases. While historians strive to eliminate bias, it is impossible to completely separate their own experiences and beliefs from their interpretations of historical events. Bias can sometimes be beneficial as it allows historians to bring new perspectives and focus on previously overlooked aspects of history.