Or they can trip and run over themselves when the tanks come rolling in. It will work out either way. They are now trouble makers, vandalists and (as Nihonjin san rightfully put it) unproductive anti government dissidents. They will no longer have support from the general public.
I see absolutely no productive measure for the inactions actually. These are not asking for dialogue , but actively engaged police for the purpose of engaging. Trust me, if ever we have such anti government protest as destructive like this happen in Japan, they would be silenced and put down in earnest and all arrested and sent to jail for sedition against the Nation.
Such wanton destructive anarchism is NOT innate in China or Japan, which treasures social harmony above all else. These are examples of radical individualism --- a WESTERN trait.
Even one of the pictures that @Hamartia Antidote posted of one protester being Carried off by police --- the guy seems like he was still screaming . No shame at all even in his demise.
I hope they beat the , pardon my French, living $hit out of him. Anarchist trash.