[a] It can't be reduced to simple math as every human life is precious and of infinite value, but murdering two people is worse than murdering one. By extension, genocide is much worse.
But is there any difference between the mass murder of, say, 1000 people that we call "genocide" and the mass murder of 1000 people that we don't call "genocide"?
I can accept the idea that a small number of murders, although totally wrong, isn't as bad as a large number of murders. But what I don't understand from your comments or quotes is whether a mass murder we call genocide is worse still - and, if so, the reasons why we say it is worse.
I'm not clear but It seems to me that you may be saying that genocide is not worse than an equal number of murders we don't call genocide. Whereas I think the mere existence of the term and discussions like this indicate that genocide is somehow different and worse than murder. Is that what you are saying?