Logic Of Salfism
There is a reason why people believe in hadiths (yes, the single narrator chain ones) even if they are not part of Sunnah (well, many scholars don’t differentiate between Sunnah and authentic hadiths), is that anything Prophet did or said defined his character and Muslims emulate his sayings or actions, and consider him a template for moral character. For example, according to many hadiths, he married Aisha at a certain age. Now, it doesn’t mean it becomes part of the religion to marry the girls at that age, but when arguing whether it is morally justifiable to marry young girls, people give reference, if the Prophet did it, then how can it be considered immoral or unjustified. Now the hadith can be wrong, but the best tools available to Muslims to verify their authenticity have been employed to prove them reliable. It is a different matter that these hadiths violate Qur’an verses if you interpret Qur’an with a different view. However, if you understand Qur’an verses from these hadiths, and how Prophet lived his life, then an overall picture of Islam emerges.