I think the issue with trigger warnings is the desire for it to take over the public. Anybody can trigger off of anything, it is impossible to predict what can bother a person.
In the real world, conversations should kind go like this. You are talking to your friend one day, you mention you got bit by a dog, describe the incident in detail, and he stops you, tells you about his trama, and you go, oh sorry man. From that point on you try to avoid bringing it up, because he asked to not bring it up, and that's what you do.
In the world that I have been reading about for the past year or so, they would have jumped down your throat for even mentioning a dog attack, talked about your privilege in growing up in an area with leashed dogs, and you should know better not to even talk about them in the first place.
I'm all for trigger warnings on sites on very specific topics, like on a support site for rape victims, it is a good idea to have the trigger warnings in there, in there if someone were to describe something in detail, that makes sense, and fits within the framework of the space. But they don't belong out of there 'in public' as it were.
I thought I did read that trigger warnings are actually harmful to people that have actual trama, that most people shouldn't be rendered catatonic when the same word describing their attack comes up in normal conversation, and if they are affected by it, the best way to heal through it is repeated exposure to it such that it doesn't cause any reaction at all.
That said I can still see respecting another enough to let them choose when they do or don't want to deal with a thing.
Still, trigger warnings and the like are ok in specific areas, just that group that wants them out there, to sanitize the world to fit their space, well, that scares me if things like that come to pass, it really does. That's my trigger.