How do movies or television influence people's behavior

There are many things that influence people's behavior. Some things make people different. I think television and movies change people's personality.
First, when a person sees a movie or television, they imitate what they see in the moves o television. Like herotic behavior or criminal behavior. Nice behaviors are profitable and it's good for our life but not criminal behaviors. It is harmful to people.
Second, when a person sees movie or television, the main character of the story is very important. So person sees him or her and they are impressive so a person will move their minds like their main character. For example when character is criminal, a person can be like him or her, when they see movie or television too much.
In conclusion, television and moveis can effect and affect us much. Some of thes are people can imitate the main character and change their mind.