Content warnings are usually more than enough for this kind of thing. I don't get mad at people who don't want to deal with heavy topics in their media - some folks are survivors of such real life horrors, and they may not be in a good headspace to deal with them in a game/movie/book/whatever. Good on you for being willing to explain your decisions in a reasonable way, and for including those warnings.
About the only reason I'd recommend a SFW mode in future projects like this one would be for the streamers and Let's Play types who might fall afoul of platforms randomly deciding this isn't "advertiser friendly" or somesuch silliness. But that's a personal suggestion, you do what you feel you should do.