Most of the information in our family histories is in the public domainThere's a world of difference between information being scattered in
paper archives all over the world and being readily available on the
internet (which is what is usually meant by "publishing" these days). It
is difficult to predict the kind of damage you can do to someone by
publishing on the internet ever so innocuous personal information.
That's why you should reserve the judgement call to the people
concerned. It's not just a good idea, in many countries it is the law
(EU directive 95/46/EG of 24 October 1995 on the protection of
individuals with regard to the processing of personal data and on the
free movement of such data). In other countries, it remains a good idea.