Role of the Buddhist in preserving the original teachings

This is a very common dilemma. If you go look for some Buddhist books here in the west (I guess the same thing happens in the east) you will easily find books written by monks and general authors, it is not common to find the suttas. That would be equivalent to look for books on Christianism and don't find the Bible, curiously it doesn't happen, it is easier to find the Bible than books written by priests for instance. The point that I'm trying to make is that sometimes those books, unfortunately, ignores or even contradicts some of the basic Buddha's teachings, they can create misconcepts in people's minds. I'm not talking about different schools, I'm talking about the original teachings shared by most of them, the suttas. When a Buddhist faces this situation, when he finds someone with a wrong concept, something that clearly has no basis on the Buddha's teachings, either Vinaya or Sutta Pitaka, what should he or she do? Should he/she correct the person or just let it be? I would go with "correct" however you will see that most Buddhist leaders don't do that, they prefer to ignore misconcepts and focus on what they believe to be right, there are lots of precautions to avoid long debates in Buddhism... this is why it becomes a dilemma! What to do?