Lucid dreams have their own values, such as storing power and energy, ability to travel, in cases when you need to remedy situation, use your will, have an influence, interfere in the event, i.e. to become active. It often happens that in a dream with an inappropriate course of events it is how we act or want to act.
Perhaps, some people do not know about or do not think about that. Those who, for whatever reason, also lives the night life in the mental world and develops the ability to control dreams, knows that this one of the goals for dreamers is to change the scenario of the dream. For what reason, you may ask, does anyone do it? The answer is the desire to affect the events in the physical world. In the mental world, of space of options exhibits in a huge variety of alternatives. In the physical world, only those alternatives exist, which have already occurred, i.e. have become realities.