Not possible. A call to violence may use the same words as a description of a violent event. Human judgement is required, so perhaps flagging might be better. But even that I'm not convinced of as you've offered no list of words to even assess, nor can I even imagine a viable list much less a single word.

Yes, most Q stuff is retarded, but that's not a reason to ban it. Whoever posts it obviously needs the community to teach them how/why it's retarded.