im not sure what you are applying in your title: the CRY of lashon hora
but your question was answered there in numerous posts, in numerous ways by different posters, and with examples and at least one real life incident
here is a quote from my first post there:
“it is lashon hara to post it here.
in private discussions with an individual who needs to know the information, it may be permitted. when it is and isnt needs Halachic guidance.”
so the answer to your question if you still need one is YES
there are times “when someone’s looking for serious information that its permitted to give the truth out? ex. camps, seminaries, etc.”
but remember, to post negative information here where it will be read by thousands of Jews who have NO NEED for the information is lashon hara or motzei shem ra, in most cases.