I certainly see the comparison and I devoted the May update of the hub to the topic. The short answer is that I see the combination of many forces putting this key in play but not yet turned.
There were more than 300 riots in major and minor American cities between 1965 and 1968. We're not there yet. Yes, the financials are comparable to the Great Depression, but we have social security, unemployment insurance, FDIC insurance, Medicare and Medicaid, and a host of other reforms that Americans lacked previously.
My sense is that the Trump administration is in full control of this key; I expect they will continue to shrink to the task and the unrest will continue. Rioting will not last forever, it never does. But if the administration fails to resolve underlying issues or adequately heal the nation in the coming months when the campaigns kick into high gear then this key will turn.