But the thing is, people who stream like that usually do it - not for people that don't want to spend money on the artist, but for people on the other side of the planet that really can't come to those events.

And to be fair, people who listen to crappy live streams without even images are true dedicated fans! They often buy merch, cds and stream the MV. They just can't afford the 1500$ plane tickets / hotel / days off.

Suing a fan like this is a bit much IMO...

It must have been very traumatic to that fan that he/she may hate on the artist he/she's fond of.

for me, it's too much to call for police and even sue that fan after all that person is still a fan of IU and may even spent for her merchandise and concerts. They get money from fans that way so they must treat them with respect also.

I just hope that these artists and their labels must refrain from treating some of their fans as enemies or criminals. They are fanatics who expressed their adoration for them. These artists and their labels knew and are aware of these happenings especially if the artist is popular so they must prepare and take action if it gets over board but in a humane way.