Could also be explained by anarchists being aware of how the word has been maligned, and are wary of being 'caught.' States in the past have executed people simply for being anarchists, with no actual crime. And when you look at the crimes that did occur under the name of anarchism, it really looks like false flag stuff. So I'd say, if it looks like anarchists aren't doing anything, that's because they aren't dumb. 

 There is plenty of room to take action carefully instead of trying to get caught. No one from either camp demands you be a martyr. 

 Agora rising. 🙏