I guess it depends upon how much they let such a belief influence their actions. As best I can tell, most who believe in the Rapture are no more or less likely than anyone else to save for retirement, their kid's education, etc. (factoring in socio-economic status, since I believe these sorts have both less education than the population as a whole and are probably more likely employed in fields that don't guarantee stable employment, e.g. construction, retail, etc.) This group should of course be left in peace to the extent they leave you that way. As silly as I might personally find the "Beam me up to Jesus, Scotty" (leaving behind fillings, eyeglasses, hearing aids, heart valves, fake eyelashes, clothing and so on) brand of Christianity, doubtless I believe a few things they'd find equally silly.
Tolerance does NOT mean acceptance, despite how confused the terms seem to be becoming these days.
The David Koresh types are a horse of a different color. I'm honestly not sure what the best approach might be. If the association by members is voluntary and not coerced, I guess I'd say leave them in peace as well...the problem being that such groups seem to warp both their leaders and members over time, and issues of physical and sexual abuse inevitably crop up. And when the authorities try to address the latter stuff, screeching about having their religious rights infringed is also inevitably cited, giving the group a nifty -- and false -- smoke screen defense. Certainly the way the Clinton administration went about the Koresh matter was a clusterf**k of the first order, though I'm not sure exactly what they SHOULD have done, in all honesty.
And, finally, there's Blondie...
[youtube]http://www.youtube.com/watch?v=pHCdS7O248g[/youtube]
Rapturists of that sort I'd actively encourage.
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"The man who has fed the chicken every day throughout its life at last wrings its neck instead, showing that more refined views as to the uniformity of nature would have been useful to the chicken." ? Bertrand Russell