What do you think is more important?
a) A theoretical physical preservation of Scriptures in a perfect shape "somewhere", even if not used or known
b) A preservation of his holy people, i.e. church?
I have to go to work, I'll be back later. But I think you can't do b without a and that's what those verses in Psalms is saying in my opinion and according to the grammar in KJV. The word of God protects us from those that puff, it's our sword in battle right?
Also "a" is used and known.