The St Paul Principles are a good baseline for solidarity and support:

1. our solidarity will be based on respect for a diversity of tactics and the plans of other groups.
2. the actions and tactics used will be organized to maintain a separation of time or space.
3. any debates or criticisms will stay internal to the movement, avoiding any public or media denunciations of fellow activists and events.
4. we oppose any state repression of dissent, including surveillance, infiltration, disruption and violence. we agree not to assist law enforcement actions against activists and others.

From what I can tell, some folks messed up bad. I'm glad some cop cars got torched and I hope these folks avoid capture.