I'm not talking about some kind of prissy pedantic legal definition, I'm talking about how ordinary people talk about these things. Yikes, why can't a simple point get recognized around here?
But I think in this case it's more than just a prissy and pedantic definition. Homicide is only really a legal term; and it refers to killing people. Then there are all kinds of different types of homicide depending on whether it's justified and whether it's intentional.
Genocide is killing a whole people, rather than just individuals. You seem to be invoking some kind of concept of justifiable genocide; but it's clearly still genocide. We are obviously having difficulty with conceiving what could justify genocide; and the Bible passages quoted don't shed much light on this.