Bandits are usually stereotyped as being bad because of the things that they do in society. It is believed that bandits are usually prisoners and have committed serious crimes, which causes them not to be left out in soicety because of the safety of the public or even petty crime such as robbery or shop lifting.

Here is an article that shows three different types of bad behaviour that occurs in society today.
http://itsamysterytome.wordpress.com/bad-bandits/

I believe that bandits are bad due to bad behaviour. A majority of bandits are usually youths or members of a gang that pressure their peers who are around them to fit in with the gangs rules.

As heard from a friend who had been involved in a gang had told me that it is was a tricky situation to get out of because of loyality within the gang and betrayal if you wanted to quit, which can lead to serious conseques or even death.