We're not going to discourage self-mutilation RP unless it's done with excessive graphical detail. Excessive graphical detail is, unfortunately, as far as we're going to classify it (we'll deal with reports in a case by case manner).
If you've been made deeply uncomfortable by the RP happening around you, ask the person making you uncomfortable to tone it down. If they decide not to, let us know (message one of us on the forums or in-game) and leave the environment. Quit minecraft, or turn off your computer, take some deep breaths and have a think about how you might avoid that sort of RP in the future, if you feel it will continue to upset you.
Roleplay is not going to be your safe space, it will not be trigger-free, and we will not penalize our community to appease a vocal minority. We want to offer the freedom to engage in an escapist world where almost anything can happen, and that includes unsavory and unhappy events.
PS - If you're one of the folk whose RP makes someone uncomfortable and they politely ask you to tone it down, be a cool dude and do it. It's nice to be nice.