Simple, They just want to get an easy way of earning money. Cheating and stealing are part of our human nature. We do have a devil inside of us and we are fond of taking advantage to those people who we know are vulnerable. Scamming has been around in any type of industry, and we can't contaminate those people as they can easily jump from industry to another. Some people tend to scam due to influence of other people, urgency and etc.
That's correct, people are intended to commit bad habits just to provide their vices they don't care about what will happen to their victim, same with Bitcoin, lot of scammers around and if your are new in this forum much better if you all safety measurements just to avoid scammer. People are intended to scam some account because it is easy money for them. In just a couple of minutes they can easily get your attention because of their flowering words so avoid talking person online that you don't know his/her identity to avoid scammer.