I've been mulling over an idea for a YA sci-fi about a character that travels back in time and goes undercover to prevent various tragedies. One of the incidents she has to prevent is a mass shooting at a high school. My question is, would this topic be too controversial for agents? I don't think I would focus on the actual shooting, just the build-up, but I know this is a very sensitive subject. Stephen King even banned his own book, Rage, because it allegedly inspired so many real-life shootings.
Would it be better to switch the tragedy she is trying to prevent to something else or should I just go for it and hope that I can handle it carefully enough that it doesn't trivialise a very serious problem?