That time frame also matches the rise and fall for the use of leaded gasoline, which has been theorized to be the cause of the crime rate rise and fall. [1]<p>You seem to be suggesting that liberal Supreme Court rulings caused the crime wave, and conservative backlash in the justice system curbed it. The conservative backlash may have been triggered by the crime wave, but I don&#x27;t think liberal rulings caused the crime wave. The recent swing back to the liberal side, with the political changes you mentioned, and no corresponding increase in crime, seems to bear that out.<p>[1] <a href="http:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;magazine-27067615" rel="nofollow">http:&#x2F;&#x2F;www.bbc.com&#x2F;news&#x2F;magazine-27067615</a>