You can learn a lot about a person when he or she cannot explain her views, cannot rationalize them and provide any logic what so ever. Those views are then, as you nicely said, a blind acceptance of a certain ideology that we never question. Not questioning our own views and the ideology we hold dear leads to fanaticism and is dangerous. People start to identify themselves with the emotional comfort a certain group may bring and neglect the fact that critical thinking is a good thing :D