We've heard exchange getting hacked and millions of dollar worth crypto being stolen.
Last year, Myetherwallet was exposed and hacker penetrated and stole alot.
Scam ICO made away with millions in recent years.
Crypto traders and investors are taking precautions so as to not fall victim. This doesn't guarantee Scam free Crypto space coz right now someone is being scam.
What could be the biggest Crime in cryptocurrency
Some of the things that you have written have happened due to the awareness and the naiveness of the users. For example, if someone invests in a Scam ICO it is only his fault and he is to be blamed for that. It is like they are feeding the scammers.
All the scamming and stealing attempts in the crypto community can be stopped if people start reading about how the ecosystem works, what to avoid etc and many of these risks will be eliminated.