Quote Originally Posted by TheAbominatrix
Even Beryl wasnt evil to begin with.
Wasn't Beryl in love with Endymion, therefore jealous of Princess Selenity. I assume Metallia played on this to manipulate her into attacking the Silver Millenium.

I think Beryl's love was more hinted in with the manga, though in the original Japanese anime they do show a short scene of Beryl looking jealously at Endymion and Selenity after Sailor Moon and co. finish her off.