It's the most straightforward interpretations with the fewest assumptions. Occhams' razor says it's the most likely to be correct (or the least flawed one).
Only if you don't know anything about how ISIS' interpretation compares with other interpretations, both classical and modern.
This is what I said, yes. The question which you dodged was why is it like this? Why can't you guys just say "these stories are fake and will no longer be part of our sacred texts"?
Because of the way
hadith collections arose, their use as legal proof-texts by the various
madahib, and the way
'ilm al-hadith developed to sort through the traditions recorded in all of these. The first collections, called
musannaf (such as the
Muwatta' of Malik ibn Anas), were basically transcripts of legal discourse, containing Prophetic
ahadith, the reports of the Companions, the rulings of jurists, and the interpretations of scholars, all organized by specific legal topic or issue. Because of their nature as reference handbooks, these books were not concerned with proving the authenticity of the reports contained within, but merely documented the development of Islamic law as it was practiced in the early period of Islam.
However, each region had its own legal tradition that arose during this period and that was reflected in these
musannaf, the early forms of what would become the Sunni and Shia
madahib. As scholars from various regions interacted with each other, they naturally came into conflict regarding the primacy and accuracy of their respective legal rulings (and the legal basis thereof). This was exacerbated by the fact that each region often had its own
hadith traditions that different from, and often contradicted, that of the others. This sparked a boom in
hadith documentation, as the partisans of each
madh'hab strove to prove the rightness (and righteousness) of their legal rulings by obtaining as many
ahadith that they believed supported their position as they could.
These new collections were massive, encyclopedic works, sometimes consisting of hundreds of thousands of
ahadith. The various schools all had no problem using weak or even forged traditions to back up their legal rulings. The first rules of what would become
'ilm al-hadith were developed as part of these legalistic polemical duels, as each school would call out the others for using these weak and/or forged traditions, while still continuing to make use of those traditions themselves that supported their positions.
As part of this, the
musannaf were replaced by the
musnad, collections organized not by topic but by
isnad, or chain of transmitter, in an effort to "prove" that the
ahadith used by a school were more authentic (and thus more trustworthy) than the
ahadith relied on by any other school. This was accomplished by attempting to draw together every known
hadith, regardless of its authenticity, since accusations that a
hadith was inauthentic relied heavily on determining how often a tradition was transmitted and by whom, which necessitated searching through the vast corpus of reports in order to discern that.
Efforts were made to winnow down these colossal collections in order to extract just the authentic ones. However, by that point the heavy reliance of each school on problematic
ahadith meant that even these
musnad were not "pure". Ibn Hanbal's
Musnad, for example, in which he purportedly distilled over 750,000
ahadith down to 27,700, contained weak traditions that ibn Hanbal admitted he knew were weak, but included because they were relied on so heavily by scholars in making their judgments. Even the attempts, pioneered by Bukhari and Muslim, to create definitive collections of only the most reliable traditions according to the most exacting standards (
sahih) ran into the problem that there were so many different competing legalistic traditions relying on so many different
ahadith that even the determination of which traditions were actually authentic and which were not differed from scholar to scholar and school to school. Complicating things was the fact that later Sunni
hadith critics adopted what Jonathan Brown called a "Big Tent" position, taking a much laxer position on whether any given
hadith was authentic or not than the earlier
sahih-era critics did, accepting as authentic enough for legal rulings
ahadith that were rejected by those early critics. For them, if a
hadith expressed something that had been believed by centuries of believers (or, sometimes, even if it had been received by
kashf, or "illuminated inspiration" - ie, seen in a dream), then it was authentic, regardless of what the rules of the early critics would have said.
This all resulted in the situation, which persists today, that there a multiple of
hadith books out there, each of which declares, on the authority of various and assorted scholars, that some
ahadith are reliable and some are weak and some are outright forgeries. And they unfortunately don't all agree with each other as to which are which. As with most things in Islam, it all depends on which particular scholar you want to believe.