1970s - second half
There was a pretty happy atmosphere after the end of the Vietnam era into the early 1980s. No Nixon, no HIV, no Gulf War I or II, no war in the Balkans, no Bush in the White House, no spam, no road rage, no watching calories, and a dominance of Apple Computer.
Those were great times for me. I don't know if that decade was less problematic than today, but it could be due to the fact I was a child and I didn't have the right to vote yet so I didn't feel a duty as a citizen to help anybody.
These days feel burdensome, and even though I vote and try to help society, I realize that positive change is a very slow process.