Calvin decided that since God was all powerful then EVERYTHING must be according to his direct will. Ergo, evil acts must be something God ordained as part of his Divine Plan.
Further, God decides who he wants to save and inflicts upon them his "Special Grace" which compels them to love him, as opposed to "Common Grace" which is what everyone else gets, does not allow them to love God, condemns them to Hell, but makes their Earthly life bearable.
Such is Calvinism.
Bookmarks