Only the Quran is guaranteed to be unchanged (but the interpretations and translations are not so guaranteed), the Hadiths are not.

The proper perspective is that if the Hadith and Quran are in conflict, the Quran is the authoratative source.

From our Sufi perspective, the Hadiths are a lot of game of telephone.

And if the Quran is difficult to apply, remember that compassion is the entire purpose of all God's religions.