Many news sources are biased to an extent, at least on certain topics or in certain geographical areas. With something like the Afghan crisis it can be difficult to obtain a truly impartial assessment of the situation and the history.
Actually, all news sources are biased to an extent. Information, knowledge, does not exist as detached from our preconceptions. Another thing is that there are outrageously biased sources of information.
The best thing you can do is to read histories from different sources.
I agree but in general, not just with the Afgan conflict.