If you don’t know why those who believe different than you believe what they believe, then it’s hard to be dogmatic about what you believe. After all, they may know something you don’t. You may be wrong and don’t know it.

That’s not to say you have to thoroughly examine all positions before being justified in taking a position and believing it to be true. You can take a position based on the evidence you have seen, but in the absence of knowing how others justify their positions and their arguments against the position you hold, you should not be dogmatic about your position.