Because some people understand that the election of Reagan, like everything else in politics, was a reaction to something else. In Reagan's case, his success was a reaction to confiscatory taxation, disastrous economic policies, and out-of-control growth of Federal bureaucracies under Carter and earlier administrations.
In the context of the times, Reagan was not wrong when he said that the scariest words in the English language were "I'm from the government, and I'm here to help." Where he went wrong was when he climbed into bed with religious fruitcakes, giving them more power over ordinary Americans' lives than even the Democrats had tried to assert.
Other people, including the most vocal on Slashdot (DURR HURR DON'T LIKE TEH GOVERNMENT? MOVE TO SOMALIA!!!11!!) don't understand the action-reaction nature of politics. They assume that things will somehow work out differently the next time their own visions of maximal statism are implemented. The neoliberal statists and Moral Majority Reaganites are just two halves of the same coin, really.