Because the poor girl is miserable!!!! It’s a mercy killing! Tamara deserves it b/c she’s clearly a bad mother, and the other guests deserve it because they let it go on in their society. JUSTICE!!!!! (I also love horror movies, for the record)
Yeah, well, pretty much everyone ends up dead shortly thereafter, and really everyone there deserves to be dead, except Lavinia, who really is the most miserable and probably welcomes death. It’s just a festival of death…