But you need police detecting scum like this:
There is nothing going on that is critical for Russia, to a certain extent it is legit that people go to the streets and have some scape valves. Intelligence needs to be very aware of what is going on, what people are dangerous and which (the vast majority) are just expressing some form of unstructured protest and need to be allowed to express their discontent, not turn them in real enemies with a well funded grudge against the government. That is the reason for the West to bring children to the streets, they hope that some disgrace happens for which they can further escalate their protests. Putin will do as he does always: wait, see and take a decision. China waited for many months in the face of extremely violent riots without killing one single of those full blown criminals. Russia will not act differently and that is perfectly correct IMHO.