Why do they still exist?

I can sort of see some the reasoning behind the world revolutionary zeal behind anarchism when it started a couple of centuries ago - I mean, there was an awful lot wrong with an awful lot about how the world was operating at the time, and hey, any dramatic change may have seemed like a probable improvement.

But come any G20 meeting, and we get the gormless anarchist "movement" back in the news:

Meanwhile, police have said they are not aware of a group of activists on social media calling on lone wolves to infiltrate G20 protest groups to 'fight and destroy governments'.

Queensland Police Commissioner Ian Stewart has told The Courier-Mail that police are aware of a number of anarchist organisations active on social media.

I mean, seriously guys and girls, have a look at the most anarchic countries around the world at the moment.  Permanent revolution still looks like a good idea, does it? 

Why not put your signs down and your silly masks and grow up by getting involved with genuine political parties?