听力原文： Although from an objective point of view, we can see joining a gang brings more danger than it saves you from, this is not always the way it is seen by kids. In slums such as the Bronx or the very worst case, Compton, children will no doubt be beaten and robbed if they do not join a gang. of course they can probably get the same treatment from rivals when in a gang. The gang also provides some money for these children who quite often need to feed their families. The reason kids think that the gang will keep them safe is from propaganda from the gangs. Gang members will say that no one will get hurt and make a public show of revenge if a member is hurt or killed. So, as you have seen gangs are a product of the environment we have created for ourselves. There are some factors that include oppression, the media, greed, violence and other gangs. There seems to be no way to end the problem of gangs without totally restructuring the modem economy and value system. Since the chance of this happening is minimal, we must learn to cope with gangs and try to keep their following to a minimum. Unfortunately there is no real organized force to help fight gangs. Of course the police are supposed to do this but this situation quite often deals with racial issues also and the police forces regularly display their increasing inability to deal fairly with these issues. What we need are more people to form. organizations like the 'Guardian Angels' a gang-like group that makes life very tough for street gangs that are breaking laws. What does the author of this passage believe is the real cause of gang enrollment?