Everywhere there is good and evil. Hackers and scammers are always there online and offline,killer and thief are  their companions. They are normal in this world that full of sin.What i have say,that you should take a lot of care to avoid them. Always keep your private key and password safe and secret. Don't trust to anyone and don't put all your coins in an exchanger for a long period of time so that they can't easilly hack your account. Then learn more how to avoid hackers and scammers out there.