We first turn to the inspired writings of St. Alphonsus Maria de Ligouri. Alphonsus lived in the 18th century and is recognized as a Doctor of the Catholic Church. One of his major themes is that nothing happens to us in this life that God does not permit to happen.
He states that we must conform our will to the will of God. As he articulates in his famous treatise, “Conformity to God’s Will,”
“The essence of perfection is to embrace the will of God in all things, prosperous or adverse. In prosperity, even sinners find it easy to unite themselves to the divine will; but it takes saints to unite themselves to God’s will when things go wrong and are painful to self-love. Our conduct in such instances is the measure of our love of God. St. John of Avila used to say: “One ‘Blessed be God’ in times of adversity, is worth more than a thousand acts of gratitude in times of prosperity.”
It is not that God wishes evil to happen. The shooter was NOT doing God’s will. But, He has given us all free will and, therefore, people can choose to do evil that is against the will of God. When people choose to do evil, God does allow that evil to be inflicted on specific people He has chosen.
In looking at the response we should have in this time of severe sorrow, Alphonsus recalls from the Book of Job:
“When the messenger came to announce to Job that the Sabeans had plundered his goods and slain his children, he said: 'The Lord gave and the Lord taketh away.' He did not say: 'The Lord hath given me my children and my possessions, and the Sabeans have taken them away.' He realized that adversity had come upon him by the will of God. Therefore he added: 'As it hath pleased the Lord, so is it done. Blessed be the name of the Lord.' We must not therefore consider the afflictions that come upon us as happening by chance or solely from the malice of men; we should be convinced that what happens, happens by the will of God.