I would steer a child away from any source which overtly promulgates a political agenda, especially an extreme one.
Of course they will not be objective.

As any sensible person would. But such sites exist, on the internet and in the media. They are accessible to all so better to equip youngsters to handle what they find rather than pretending any one is any better than another. I do, like all responsible people, try to make sure that content is suitable for their age and would say that no justification of war is suitable until they are at least 70 and reading about it in the comfort of their own safe armchairs...