Well then what is the reason esheppa, in your view? :^)
The way I see it, it's because you have made a philosophical/religious commitment to a particular view. You know The Truth. Unless my account fits within your view, it is not only false but inconsistent and incoherent. So for example, it isn't enough for me to point out that people have innate values, a fact which I'm sure you agree with, I must also explain the origin of these values or else any conclusion I draw from the existence of those values is invalid.
Basically we have different and incompatible opinions about what constitutes an explanation. I am perfectly happy with one that is, for want of a better word, incomplete and potentially (even probably) false if it can be used reliably. You are not satisfied unless the explanation is a complete ontological claim.