Nice, now that's my kind of campaign.

I'm a terrible DM but I also don't do the whole 'evil races' thing either when I do actually DM; the only such beings when it does occur being fiendish beings who come from hell or the abyss, or the undead (except for one 'undead' lich who only became a (plant based) lich because he feared death greatly).

I remember reading a forum post by Gygax (so relatively recent post, as in within the last twenty years) where he justified the killing of the children of evil races saying that a certain general's observation of 'nits make lice' (in reference to the general pushing his troops to kill the women and children of native Americans) was an observable fact.

https://www.reddit.com/r/DnD/comments/dtpgim/gygax_on_lawful_good/