Frank Morring says they were coincidence, and that failure is inevitable. I made the same point at PJMedia last week:

…it is important to understand that there was absolutely no relationship between OSC’s and VG’s accidents, other than they were both commercial activities. It was pure coincidence that they happened within a span of three days. But in both cases, response was rapid.

Nonetheless, a lot of ignorant people will try to use these events to shut down commercial spaceflight.