Can God be so unfair?

Underlying this beautiful parable is the Old Testament conception of God as the Creator who is good, that is, generous to all! 

(Ps. 145:9 God is good to one and all; everything he does is suffused with grace)

Matt 5:45  "for He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous."