"Can someone explain to me what the purpose of hybrids would be? I get that they're creepy, but what would the unknown/esoteric/evil purpose be for them?"
1) A way to torture a previously human soul by imprisoning it in a half-animal body;
2) Because many of the pagan gods are chimeras/hybrids, creating the 'real biological thing' is considered an act of adoration in the Luciferian tradition.
3) Because the chimeras/hybrids are abominations to God, Luciferians get a kick out of creating them and they think Satan will reward them for thumbing their collective nose in God's face.