Today 's conspiracism stems mainly from the instability of the late 1960s and early ' 70s--a period of both uncontrolled violence ( assassinations , urban riots , political protests turned bloody ) and anti-government ideology ( the left challenged laws regulating speech , sex , and drug use ; the right fought busing , the Warren court , and the welfare state ) .
The 1960s and ' 70s saw many turbulent events .