True enough. But there's no need for us to try and convince people they do accept the stuff in hadith when they don't - there are substantial numbers of common Muslims, Quraniyoon and the more theologically liberal who don't see any need to accept them.
I think you are however missing the target. The Qur'an is not any better a religious guide than the average hadith.
We should not hesitate in pointing out that people's religious life is not to be guided by scripture over common decency.
We
should however hesitate to hope some groups of scripturalists to turn out more reasonable than others without a clear reason to expect so, lest we end up unwillingly supporting scripturalism itself and the evils that it brings.
Of course in many parts of the world a great many Muslims don't see the need to be bound by every word of the Qur'an, like many Christians with the Bible.
Yet all too often they are surrounded by a social environment that nonetheless expects them to agree that the Qur'an is indeed binding in every respect if push comes to shove. Those great many Muslims you speak of have so far managed to avoid the brunt of that perhaps unavoidable confrontation, but who knows how things will turn out if they have to choose sides?
Is there even any upside to just accepting that and hoping for the best?
I don't think so. We should point out often and wide that there is no way for reliance on the Qur'an over decency to be accepted or even tolerated. We should draw such a line and encourage Muslims to do likewise
now while there is still some damage control to be done.