It is easier to rally large groups of human beings around perceived evils than actual goods.
The outcome of rallying around evil is usually evil.
"We Know What To Do. But Politicians Don't Know How To Get Elected If They Do It"
(Vermont's socialist Senator Barry Sanders is an exception to this rule. http://en.wikipedia.org/wiki/Bernie_sanders)
Brian Mulroney was Canada's conservative Prime Minister from 1984 through 1993.