Jonathan Meades knows what causes riots: bad architecture and the bad faith which causes it. Here's part 1 of his 2007 'On the Brandwagon'. This may be the best few minutes of your life.
Talking of Garden Festivals, I played in the orchestra at the Stoke Garden Festival. The site is now a concrete retail park fit only for joyriders, junk food and muggings. Regeneration was a mirage. And my violin playing hasn't improved either.
Meades was right. And we've learned nothing.