Crypto world is plenty of scammers, wich does offer you something very cheap or new, the thing is crypto did atracted a lot bad people wich were into fiat scam projects, now they are more safe at crypto world. There is no a valid concept why they scam, besides the easy money maker, those people usually looking for fast and easy money, and newbies usually fall in the traps, i believe they scam because the opportunity shows up to them and blind people invest and believe its possible to earn money without work.
First of all, to answer the op, its not a must that you will people money, you can also give them, if possible, you can forget about giving them money and give them food everyday. By the way, everybody is not the same, not everyone will do something evil just because of money, there are people who will never do something evil even if theyre in the mouth of their grave.
And then there are others who cant stand the pressures of poverty and are ready to do anything to make money, even if it means killing a fellow human being.