So, just to clarify, by DIY you mean one person effects the entire genocide rather than many people personally involved in the genocide, doing the killing themselves. In a sense, the Y in your DIY is singular, and the Y in mine is plural.

Also, my general schema of "DIY" is that it's a cheaper but more difficult alternative to the normal approach--which usually involves hiring someone to do your project for you or buying a ready-made product. Since most genocides tend to be executed the hard way-- you can't buy genocide in a box, although some chemical weapons might come close-- I felt that genocide is fundamentally a DIY project. It's just a ... fun ... project for the whole community, rather than one person. Like building a playground. That kills people. (This is going to a very bad place isn't it?)

I'm able to accept your definition of DIY, though I still prefer to think that genocides require a certain degree of personal agency from its participants and that second person pronouns can be plural.