Sure I agree, but Auto execs who refused to increase quality when foreign companies were, also really screwed over the common folk of Detroit. And there were other factors like automation, destruction of public transportation (again from Auto execs), and finally racism. Detroit's is 85% black, New Orleans 70%, Atlanta 60%, NYC + Boston 25%, just to give comparison. It really never was Detroit Rock City, it was/is Mo'town. And in the context of America during the 70's and 80's that worked against you. Detroit's white neighboring suburbs refused to do regional planing and business w/ Detroit as much as possilbe. Many of the white people who left Detroit wanted to see it be reduced to a pile of rubble and they got there wish.
To give you an idea of the strenght of racism in this Northern City. When my parent were going to high school on the East Side (68 -72) they went to the half white half black high school. And what happened was each year the all black high school (which by early 80's they all became) and the all white high school met at my folks high school and had an all out brawl. My parents would hide in the school rooms (w/ people of both colors) while the folks out there kicked the shit out of eachother. My dad said the black dudes would eventually start kicking some ass until the white cops showed up. They then clubbed any black person they saw. Apparently the walk home from school those days was quite daunting, a lot of residuel brawls flarring up.
On a complete side note, my dad ended up going to local comuter college, moved to Boston and made a nice carreer for himself. And these days parents view places like Waltham High the death of hope for your child. And yet a lot of these older generations did just fine under worse conditions. Hmm oversensitive are we.