What about in the scenario where you are trying to change behaviour though?
e.g. People keep joining a community to ask the same question. The sheer number of people asking that question is frustrating to existing members. Step one is obviously to make sure the info is very clearly signposted and easy to find, but there will always be people that don't look before asking.
In those cases, I'd tend to direct people to the FAQ/answer and close their topic – modelling the behaviour for future members.
This goes directly against the advice in the OP.