How so? If an article says "trigger warning: (rape/Mohammed/spiders/flashing lights)", then people who don't want to be exposed to those things (e.g. due to PTSD, religion, phobias, epilepsy - or simply because it upsets them and they don't particularly want to be upset right now) can choose not to read it.
How does it erode someone's personal responsibility to give them the information they need to make that choice?
> where is my warning?
If there's a largish number of people for whom "trigger warning: trigger warnings" would actually make life less stressful, then I'd endorse people including that warning.
I don't think that population is very large. For that matter, I don't think it includes you.