The scholars say: أن الكذب يكثر في ثلاثة : التاريخ والمغازي والسير
Many lies (weak and fabricated narrations) can be found in three: History books, writings about early Islamic military campaigns and Prophetic biographies.
Ahlus-Sunnah wal-Athar do not pick and choose from books of history, neither what is for nor against them, in fact they have been the most just and narrated many narrations that speak about the mistakes of some Sahaba. Ahlus-Sunnah haven’t watered down the truth let alone hid it, however, Ahlul-Bid’ah have taken advantage of everything that has been reported in books of history as if they are primary Sunni sources! This is why scholars have scrutinised books of history like the Tarikh of Imam al-Tabari to identify blatant fabrications from authentic reports.