Interesting little video. The first company I worked for in the mid 1970's had its HQ in Detroit. I had several training classes in Detroit back then and even at that early age I could see the city already in somewhat of a disrepair because after the 1968 MLK riots this is one city that did not tear down and rebuild. I remember we stayed in a downtown Detroit hotel and had to commute in a company van to our training classes about 4 miles away. I remember back then block after block of burned out buildings. I'd never been to a war torn country, but if this is what the looked like it was very sad indeed.
I think a more important question would be, "Why did it happen?"
I'm quite familiar with the city and I suggest to watch the "Requiem for Detroit" documentary.