In my opinion, sometimes movies and television influence peoples behavior positively and sometimes negatively. It is very hard to give holistic explanation how movies and television affect the behavior of most people, but I will try to explain.
First, people are becoming more aggressive when they watch violent movies. Today, there can be seen a lot of violent movies. These movies show how people shoot at each other or to the animals. Sometimes heroes of these movies are drug dealers, killers or thieves. Thus, by watching these movies people becoming rude and they are unable to express sympathy to other people.
Second, some good films have positive influence on people. They make people to think about their life. Good films or scientific films can give you additional knowledge about humans society and about our planet. For instance, I admire movies like "Space Odyssey" of Isaac Asimov. Films of this kind force people to think about our future and about current problems of humankind.
Third, television can sometimes give false information and that makes some people angry. Personally, I do not like when in news information is given not objectively. I hate when journalists want to express only their point of view and they do not take into account opinion of other people.
To sum up, I would like to say that stupid movies and stupid telecasts influence on people negatively, but good films and good telecasts affect on peoples behavior positively. Thus, I would recommend everybody to watch only good movies, because when you watch stupid movies you are losing your time.