You sound like you think he doesn’t need capital at all. Why would Harry avoid using a resource that would facilitate reaching his goals? Wouldn’t the rational thing to do be to use the methods that accomplish your goals in an effective and timely manner?
There are times when solutions other than money would be more effective, and there are times when money would be more effective or efficient. So why should he eschew that resource just because he can?
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.