"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life." (John 3:16)
God's love did not let sin go. True love, Godly love, does not make excuses for sin rather it seeks to deal with sin. Lust accommodates sin, godly love expiates sin. Jesus' sacrifice on the cross is a demonstration of what love really is, love is sacrificing ourselves for the sake of another, desiring the what is godly and best for them. Here God the Father loved us so much that He spared not His Son. I don't know if it is right to describe God's attribute of love with another attribute (holiness) but when I think of the cross it sure makes a lot of sense.