Look, I'm not saying it isn't reasonable to discuss whether or not a black mob would be responded to differently than a white one. That's a very important avenue of discussion. But it isn't the only one. I think the "gentle" response to these terrorists is best explained the way officials explained it in the heat of the moment Wednesday: law enforcement was severely underprepared and outmanned, and simply didn't have the capability of putting things immediately in order.
But since then, there have been manhunts and a very intensive investigation. People are being arrested and charged. In another thread, someone joked about the father/son combo who deleted their Twitter accounts after being contacted by the FBI, but it's not a joke. That's the FBI doing its job. They got a tip that someone was bragging about being involved, and they immediately followed up. The son in that father/son combo will probably shortly be in custody, if he isn't already.
Officials have said they are actively investigating - especially in light of the apparent IEDs - a conspiracy. One even went so far as to imply that the President himself is a subject of the investigation.
These weekend warriors are going to learn the truth of Grant's words soon enough: "Now, the right of revolution is an inherent one. When people are oppressed by their government, it is a natural right they enjoy to relieve themselves of the oppression, if they are strong enough, either by withdrawal from it, or by overthrowing it and substituting a government more acceptable. But any people or part of a people who resort to this remedy, stake their lives, their property, and every claim for protection given by citizenship--on the issue. Victory, or the conditions imposed by the conqueror--must be the result."
And it won't be pleasant for them. But it also won't all happen immediately. Investigations take time to do properly. We need to let this play out, and not wring our hands over the fact that these people aren't all on the gallows by Saturday morning.