I feel some kind of warning is deeply important, as it allows people to decide to skip a post instead of reading it in detail. Personally, I prefer to be given a chance to gird my brain against the potential onslaught of feelings that a serious, dark topic post might bring up. If I am ready to read and engage with a post of that nature, often a productive discussion is had as a result. As for general Trigger Warnings, I appreciate those as they activate my automated mental hardening responses and allow me to read without being overly concerned or stressed.