God loves His creation because He loves righteousness and justice. God always directs His love towards justifying His purposes. If God loved anything outside of Himself, that thing or person would be part of the reason God loves them. But God's love is not founded on the worthiness of the object. So God's reasons for loving anything outside of Himself are based on His love for Himself. This is why God is free to choose what He loves.If God loved an object because of the object's own merits, then He would need to lower His standard of righteousness. And if He lowered His standard, He would need to judge the object on a sliding scale. If He loved by adjusting judgements, He would cease to be God. It is for our good and God's glory He is free to love who He chooses not based on anything outside of Himself. We know when God speaks there is nothing outside of Himself that can thwart His word. This is why God has given us His word in absolute pronouncements. God must love us by acting according to His word without being thwarted.