I am not sure there was much of a debate for Patrick when it came to the Gospel or Social Justice. The two seemed to be deeply connected by the way he lived his live and encouraged others to live. In fact there is much of St. Patrick's life which we find a sense of both/and living rather than forcing a choice which is a limiting choice. That is what happens when we force people or ourselves to choose between things like Social Justice and the Gospel. It can and has been argued by myself and others far smarter than I, that you cannot have a Gospel without Social Justice, and you cannot have Social Justice without the Gospel. To force a choice is to limit both.
Why is it that we as humanity, especially we in the church, like to force people into an either/or corner? Often doctrinal, or scriptural purity is lifted high as the battle cry. Problem, whose doctrine or purity of Scripture shall we use? There is so much more to God, and the Scriptures given to us by God than we as humans can fully comprehend. No, my impression is the enforcement of the either/or is truly designed to great exclusivity. If we can force someone to choose one way or another, we can know whether they are with us or not. Better said, we can determine if they are truly a follower of Christ or not.
The reality the One we follow was the master of the both/and. Jesus did not simply say commit verbally to following me, and hold pure doctrine. Likewise, Jesus did not say just go around doing good deeds and working for justice. No! Both things were deeply connected to the Kingdom of God, which by its very nature is a both/and kind of place. It is both present and future. It is both fulfilled and yet to be fulfilled. It is at hand, and yet to be embraced. I wonder what would happen if people who claimed to follow Christ began to see how broad, and deep God is. Life is not as easy as forcing a choice. Many messes are created by allowing room for both. Yet who ever said Kingdom living would be easy, and neat?