For me, the significant part is in the explanation, 'because they cannot bear to bring their studies to an end.'
As for, ' have been known never to publish'--
Good researchers seek definitive information before publishing, because if they publish faulty, or not up-to-date information, they can be criticized for not having been thorough or accurate. If the information in the National Archives is so divisive on a given subject, that divisiveness complicates the development of a publishable point-of-view. But 'known never to publish' would then be best explained by a fear of being wrong, not because 'they cannot bear to bring their studies to an end'.
If the information in the Archives is so seductive, there is the possibile implication that it is more interesting to continue researching than to bring the studies to an end.
Given that final because clause, I think I like seductive better.