What also leads people to scam is greed. When people are greedy, they find it difficult to reason and make some research to know how reliable what they are planning to get involved in is. Greed makes one lose patience, and any offer from scammers will be so fast to grab, thinking that if they waste any time, they will lose the opportunity of getting the money.
It is very important to set aside greed if you don't want to be scammed by scammers because greed makes every offer look real and gives the impression that one doesn't need to miss the opportunity.
When some people come across a scam, their instinct tells them it may be a scam, but they have the confidence to take a step to try what it is all about, thinking that if it is eventually a scam, they will be able to run from it. However, in the end, they still get scammed.
You are very correct, the main reason for people been scammed is greed. I always tell people that if you are content and not greedy you will never fall for any scam.
Imagine people that fall for ponzi schemes, my question is how do they believe that you just give money to someone and you get double or triple the money in some days or weeks. They never bother to ask what investment they will invest their money into for it to generate such profit. The answer is greed, they only see the profit they want to make and don't bother to ask questions. So my advice will be don't be greedy and you might escape being scammed.