How powerful is illusion?

We often hear some rumors without any strong evidence or any approved evidence, such as some comments like the social security is worsening. Currently especially when the US presidential election is taking place, some politicians often give some very subjective comments. There are some comments like "the US population feels unsafe". This comment could be true, as subjective preferences are often interactive. We always face a lot of constraints that the subjective views help us to make decisions; however, subjective thinking could be used. Individual preferences could influence each other and usually more limited constraints are, more interdependence preferences are. Because when we have fewer resources, we are unlikely to come out some useful objective conclusions. Therefore, when we go into some fields where we do not have enough resources including knowledge and time, our actions are easy to be influenced and manipulated by others.