There are basically two kinds of fatwas these days; evidence-based or interpretation-driven opinions. I find many, if not most, to be of the latter kind, and I have no problem whatsoever in dismissing, refuting, and rejecting this sort of opinion because it is not a dismissal, refutation or rejection of evidence, but of the interpretational reasoning.
For example, when you tell me that such and such is haraam because of :
وَتَعَاوَنُواْ عَلَى الْبرِّ وَالتَّقْوَى وَلاَ تَعَاوَنُواْ عَلَى الإِثْمِ وَالْعُدْوَانِ
Yeah, that is not convincing; you have not proven that such and such thing is bad in the first place; and a whole lot of fatawa use this kind of presumptive logic, and I don’t think anyone is obliged to accept it