That kind of incident happened lack of knowledge and our greedy nature when we take action without making any research and letting know who is behind the scene. The people must have to understand how this ecosystem than we can reduce the risk factor to being get scammed otherwise we will hear this kind of sad stories.
The scam only works because people don't think if they can have a few bucks for free. Then they invest blindly. It will take a while for the last one to realize the intention behind such assets. They have to learn it, even if it gets expensive for them.
Nonetheless, it is slowly getting out of hand and Waves should consider making such assets as possible scams or, on the first trade of new assets, display a message box indicating that there is a possibility of a scam including information about knowing scam patterns. At least, this could increase the awareness.
Agree with both about the responsibility of the people involved ( greediness and/or lack of knowledge) but if the goal is the massadoption of waves, or of cryptos generally speaking, the efforts of learning how to read a smart contract is an important obstacle to it.
So tagging an asset would be a good solution in my opinion for lazy/non tech savvy people even if in contrast with the decentralized nature of this thechnology.