Was LE response to the Berkeley riots the right approach?

On April 15 (tax day) pro-Trump individuals wearing American Flags and “Make America Great Again” baseball hats held a rally in Berkeley, California. They had notified Berkeley Police in advance of their intention to rally. However, when anarchists clad in black masks and wielding various weapons showed up, officers from the Berkeley PD stood back and allowed the two sides to get involved in a prolonged violent confrontation. This is not what most police agencies would call crowd control. Jim and Doug talk about what should have happened but didn't.