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Most of them don't, of course. In fact, psychologists say that many members of militias and similar groups are ordinary people who take ordinary ideas to extremes. "If you think these people are crazy, then you have to ask [if] there [is] anything the Federal Government could do that would make you willing to take up arms against it," says Clark McCauley, a psychology professor at Bryn Mawr College. "If you can answer no, then you're entitled to think these people are crazy. But if you say yes, then you'd better hazard a thought that they are human beings just like you." --By Christine Gorman. Reported by Lawrence Mondi/New York