Posting credit card numbers will probably cost someone else. Posting recipes for bombs may result in physical harm. Resource sharing services are not like anything else. A computer network is neither like a home computer system nor like any other single computer system. The damage that can be caused by mistakes or malevolence increases with the power and extent of the system.
People depend on networks and conferencing systems.
Damaging such a system damages people. Don't leave a security hole unfixed. A system administrator who installs a system with a well-known user and password combination or who fails to fix a network service security problem to which the solution is well known invites abuse. Vendors who distribute systems with such problems contribute to the problem and increase the likelihood of widespread abuse of such holes, as in networks. Users who choose obvious passwords should know they are increasing the likelihood of damage not only to their own files but also to those of others.