People scam because they want money fast and easy scaming is the one that can get you there but you need to be really good in it otherwise you will not be able to get there as fast as you actually predicted because if someone knows who you are you need to pay everything back real fast.
People scam because they think it is easy way tp earn money where they have to use other people for that. They do not want to work hard for them to earn without thinking and do not have conscience on what will happen to the victims if they do something like that. Thinking about themselves and their greediness inside is awaken.