I think the general belief is that they are being irrationally over-pessimistic due to panic over the daiichi situation, and that this can be exploited by peopl

I think the general belief is that they are being irrationally over-pessimistic due to panic over the daiichi situation, and that this can be exploited by people whose distance affords them a more cool-headed approach. The market as a whole may be rational, but individuals in the middle of a tense situation probably won't be.