Bringing this back to the 'content warning' idea for a moment. (And I will say, I prefer the name 'content warning' to 'trigger warning' because while all trigger warnings are content warnings, not all content warnings are trigger warnings. For example, movie ratings for 'sex' or 'extreme violence' are content warnings, but not trigger warnings.)
I think the talk about "Well real life doesn't warn for content, so I'm not going to warn for my comic" is disingenuous because it misses the entire point: that this is a comic to be read for fun.
Yes, of course real life isn't going to have content warnings before something horrible happens. Tragedy happens with no warning whatsoever sometimes. But a comic isn't real life. Reading a comic is an activity people do for fun. And when people go looking for something to do for fun, they're going to read reviews and summaries to find something they personally want to do.
Here is an example of what I mean: I don't like spiders. I REALLY don't like spiders. In real life if I see a spider I have to call in someone else to take the spider out of my room and move it outside. Or if it's in a public space I quickly move away from it. So when I'm looking for something to do in my free time, I still don't want to see spiders. So if I see a warning of "hey, this page here has lots of pictures of cute little jumping spiders" I say "awesome, good for you, enjoy those pictures. I'm going to go somewhere else, thank you." I don't expect people to jump in and tell me "hey Maple there's a spider in your bedroom", because that's not realistic. But if people post pictures of spiders all over a web page without at least going "there be spiders here" then I get annoyed, because I don't want to spend what little free time I have looking at spiders! I want to do something else!
That's a bit simplistic of an answer, but it's the idea. Entertainment comes with content warnings all the time so people can make a personal judgement of if they want to consume that entertainment. Movie ratings, series summaries, book reviews, that sort of thing. Content warnings are everywhere in entertainment, because entertainment is supposed to be fun and making informed choices on entertainment is important to having that fun.
I just think it misses the mark to go "Real life doesn't have content warnings", because that's not the point. You don't see people saying "Real life doesn't come with ratings, so let's remove ratings from movies."