You get into problems when you turn these things into fixed recipes. Prudential judgement is something you must learn and keep learning all your life, and the heart of prudence is humility, which is to say, a submissive attitude toward the truth in place of willfulness (something that comes easy, and is celebrated by our morally bankrupt culture). There are general principles, yes, but the application of them in the concrete and particular, as it were, is subject to prudential judgement.
