I just don't understand Paul's reasoning.

Read through this and I'll comment at the end.

1 Corinthians 8:4-13(NKJV)

Therefore concerning the eating of things offered to idols, we know that an idol is nothing in the world, and that there is no other God but one. 

For even if there are so-called gods, whether in heaven or on earth (as there are many gods and many lords), 

yet for us there is one God, the Father, of whom are all things, and we for Him; and one Lord Jesus Christ, through whom are all things, and through whom we live.

However, there is not in everyone that knowledge; for some, with consciousness of the idol, until now eat it as a thing offered to an idol; and their conscience, being weak, is defiled. 

But food does not commend us to God; for neither if we eat are we the better, nor if we do not eat are we the worse.

But beware lest somehow this liberty of yours become a stumbling block to those who are weak. 

For if anyone sees you who have knowledge eating in an idol’s temple, will not the conscience of him who is weak be emboldened to eat those things offered to idols? 

And because of your knowledge shall the weak brother perish, for whom Christ died? 

But when you thus sin against the brethren, and wound their weak conscience, you sin against Christ. 

Therefore, if food makes my brother stumble, I will never again eat meat, lest I make my brother stumble.

So here is my question.  Why would the weak brother perish from seeing someone else exercise the full freedom and benefits of knowing Jesus and knowing Scripture?  Paul just said that food does not commend us to God. 

Wouldn't it make more sense to use this as a teaching opportunity?  After all Scripture does tell us that the truth will set us free?  Why would Paul not take this opportunity to instruct someone on the truth instead of hiding it from them?  Hmm?