Jesus desires mercy. Jesus desires that we show great care and concern towards those who suffer in miserable conditions. [Oh, no, is this an issue for immigration in the USA?]
Look at the example of the Passover in Egypt. With blood on the door posts and Passover food on the table as in flight, how do we know that God does not saves some Egyptians along with the Israelites?
Without mercy, there is no Passover. Without mercy there is no Mass, that is, The Eucharist.