Let me explain in simple terms NOTHING goes against Quran! If it does it is thrown away! Now you insisting on the opposite is sheer arrogance!
1) no one calls them AUTHENTIC - THAT title goes to Quran ONLY!
2) They are a reference guide ONLY not the main book (Quran is the main book) ! No one takes it the otherway round hence any mistake(s) in the hadith is blamed on the hadith not on Islam .....
3) The guy COLLECTED THEM...He traced people whom he "heard" had some hadith and he traced the people and wrote the narrators...He didnt have 100% resources to validate hence why behind his book it is written if any hadith contradicts the Quran throw it away...EVEN HE doesnt want any responsibility of such crap which you love to quote!
4) He wasnt a Muhadith...He was a collector not a varifier! Hadith verification is a science that is being advanced every now and then and one NEEDS to be learned in the Science to be considered a Muhadith!
The torture part was covered by
@TankMan please read his post!