Because JWs say they can give them answers. Simple answers.
In one of my classes this week we've been reading Frances Fitzgerald's _Cities on a Hill_, which deals with different communities in the US in the early eighties. One of those communities is Jerry Falwell's church. What she said about their attitude toward education struck me as very familiar.
(p. 158-emphasis mine)
For Thomas Road people, education - in the broad sense of the word - is not a moral and intellectual quest that involves struggle and uncertainty. It is simply the process of learning, or teaching, the right answers. The idea that an individual should collect evidence and decide for himself is anathema. Once Falwell told his congregation that to read anything but the Bible and certain prescribed works of interpretation was at best a waste of time. he said that he himself read all the national magazines, just to keep up with what others were saying, but that there was no reason for others to do so...But what bothers the most pious members of his congregation is not just that the schools teach the wrong answers; it is that the schools do not protect children from information that might call their beliefs into question. When I asked Jackie Gould whether she would consider sending her children to something other than a Bible college, she said, "No, because our eternal destiny is all-important, so you can't take a chance. College so often throws kids into confusion." The purpose of education, then, is progress in one direction, to the exclusion of all others.