I saw that one. It actually sort of inspired this one since I saw so much support for voluntary Controllers and that made me realize how much I hated the idea.

I think one of the key points is the issue of genocide and people viewing the entire species becoming nothlits as genocide. I don't think something counts as genocide unless someone is dying and the Yeerks aren't. And even in the case of culture being wiped out, I dont' see why Yeerk nothlits couldn't preserve it. They'd have to morph sentient species to have sentient offspring and pass it down, of course, but if they remained Yeerks they'd be infesting sentient species anyway so I don't see that as a big hardhsip.