Time was the saying was if you fall off the horse you have to get right back on. Today we'd keep you away from horses, pictures of horses or even hearing the word horse for the rest of your life.
Triggers are real, We all get that, and it is respectful to mind what might set someone with recent issues off. Thing is, eventually, even the soldier needs to be able to hear a car backfire without jumping for a foxhole, the person in a car accident needs to get behind the wheel, and the rape victim needs to not jump at anything that reminds them of the occurrence. A trigger is like a form of mental injury, yet if it was a physical injury, you'd expect to let it heal and get back into life. Yet as it's mental we let it linger and a trauma becomes a lifelong disability.
And as I like to say, that's the best case scenario. The tumblir crowd has little idea of what real trauma is and often use the term trigger as a way to justify asking others to never take them from their comfort zone, or bury themselves in self pity that people aren't propping up their self esteem and saying mean things to or about them. It's all the harm done to the first group without the reasonable excuse to get to that point. Moreover its a sign of real self esteem and other mental health issues that aren't trigger or PTSD related getting undiagnosed and enabled. Someone legitimately near suicide over harsh tweets is not mentally well and needs treatment to deal with negativity, not shelter from said negativity.