Who are you (or any of us) to decide what people should or shouldn't get angry about? They quite obviously do have their reasons, you just don't agree with them.
Not all reasons are valid or justifiable.
Who is saying it should be shrugged off?
Some people in this thread!!
If they wanted to scare them or stop them from speaking, they'd have done something during the day, during the conference, when they were actually there.
Ridiculous comment. But they were also there during the day, with their megaphones and signs.
Nobody was hurt, nothing has been disrupted. I'd say it's a good thing that the media haven't given it the time of day.
It has been in major newspapers. The BBC has reported on it.
In the past, TRAs have disrupted and hurt people. It's actually a bloody miracle it didn't escalate this time, but maybe the vandalism (which is no big deal to you) had the police on their toes for once.
Edited