I believe DProps prevents this, and its on the workshop for free. It wont prevent clever minges from constraining props together and such to make them spaz out and kill others. There are a few scripts on the workshop to prevent props from damaging others, but there's no way to differentiate between whether or not someone got killed by someones hand or if the prop was just forced by something non-human. I'd buy an add-on for this if it gets that annoying though tbh.