The first is to assume that your beliefs and causes will triumph. There may be solid evidence for this: as solid as Nevada's law banning gambling forever. (Passed 1909, took effect 1910.) Or the victory of monarchial power in Britain after Oliver Cromwell's death.
The second is to be certain your side will go down to defeat. The Satanic [liberals, conservatives, greens, pugoristas] will win. The Soviet Union will prevail over the free world -- oops, that one doesn't work any more.
The third is to take for granted that future politics will be just like today's.