What One Preacher Learned About "Scripture Alone"

Catholics agree with Protestants that Scripture is a "standard of truth", but not in a sense that it rules out the authority of Tradition and the Church. No biblical passage teaches that Scripture is the authority or rule of faith in isolation.
More importantly, there is no unity in Scripture Alone. If there were, there wouldn't be over 33,000 different denominations of Protestants around the world. Sola Scriptura falls apart everytime one opens the phone book and counts the number of churches in any given area.
For me, one of the shaky bricks in Scripture Alone came from a Baptist preacher years ago who told me of his troubles in a small town church.
The church was divided. One part of the church wanted things their way, the other side violently disagreed. This got to a point where the different factions would sit themselves on opposite sides of the church trading irritated glances and whispers among themselves. The pastor was in the middle, any sermon he preached would be seen as favoring one side over the other. So he came upon a wonderful idea:
Just read the Scriptures without comment and let God sort it out.
He chose, for better or worse the Book of Psalms.
"Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful" generated shocked looks that told this poor preacher that it was not being taken as David perhaps wrote it.
"Why do the heathen rage, and the people imagine a vain thing?" At this point there was murmuring in the pews. "Lord, how are they increased that trouble me! many are they that rise up against me." The congregation, on both sides, were in a rage. One lady walked out. "O ye sons of men, how long will ye turn my glory into shame? how long will ye love vanity...?" Two more walked out and the head deacon interupted. The service was stopped and the preacher was forced to resign on the spot.
It wasn't the Scriptures, it was the WAY he read them. He OBVIOUSLY meant it for thier little group.
In that brief, unshining moment, that preacher learned something about "Scripture alone".
It doesn't exist.
No person has any guarantee of discerning those proper teachings in scripture, when read outside of the light of the Church. Every Protestant knows other "bible-believers" get the wrong teachings out of scripture, sometimes to the point of not even being considered Christians. They just seem to have a hard time taking the next step, which is to acknowledge that they themselves may also get the wrong teachings out of scripture.