Even if it was Hive account@netuoso, there's nothing malicious about trying strange operations out and seeing how the blockchain will be able to handle it or not. Imagine this happened after we already had millions of active users, it would be much worse. I'm glad Hive account@nijeah did what they did. After all, a fix was found, though not without lots of stress for all the witnesses/devs involved, I am sure.

Edit: Obviously I realize the seriousness of the situation. I'm also not a developer/witness so I'm somewhat ignorant about the proper procedures. But I expect the STEEM blockchain to be strong enough to handle something of this nature. If it cannot, there is no reason to use it over another coin. I'm sorry, but I just cannot blame the user who initiated this operation. Clearly it would have been wiser to make the attempt on a testnet, so perhaps there was some malicious intent.