Consider dry cement. Alone it’s nothing. Combine it with water and you have a substance as hard as rock. By themselves they’re not very stable, but combine them and you have a sure foundation.
Half truths are a lot like dry cement. Building on half a truth is like building on sand. The bigger you build your argument the more obvious that it is unfounded. Most logical fallacies are built on have truths.
The problem with half truths is that they only give you, wait for it, half the truth. Instead of examining the full explanation for a particular issue, the culprit settles for just enough information to confirm their suspicion. Then they go spouting their new found evidences as the end-all to the argument.
Half truths play off of your preferences. If you are bias toward a particular idea you are likely to believe anything you hear without actually checking the source. It’s called confirmation bias. The point is that half truths tend to bring out the notions you already held to.
Because half truths play off our base prejudices, it’s easy to be duped by one when left uncontested. Many well intending people have postulated ideas built on weak foundations and faulty reasoning. I’ve even been known to do so from time to time. That is why discussion is so valuable. Half truths left uncontested are like cake on your face, a nasty cowlick, or a barn door left open. They ought to be pointed out.
The worst problem with half truths are the applications. Most people would respond to a notion that God hates Americans as a harmless vitamin deficiency or a product of inbreeding, but when those people start picketing funerals it’s evident that their ideas have had negative consequences.
This is a serious issue that Christians need to address. Too often our confirmation bias has us latching on to something that isn’t true. When we go around proclaiming condemnation on half the facts we not only look foolish but we are postulating a lie.
Don’t be fooled by the mastery of the devil who is the king of fools and prince of lies.