OH, PLEEZE!  Jesus, himself, could have given an explication of the call of Matthew, and you would have found fault with it.  
Where are the politics in Francis' homily, that you are mentioning?  What the homily does state, plain and simple is that Jesus came for sinners [in his time and in today's world].  He did not come for the people always demanding from others---litmus tests of dogma, doctrine, the Teachings of the Church as the hallmarks of 'orthodox Catholicism.'  Those who do demand this, are the current pharasees embedded in the Catholic church.  They are no different than those pharasees in Christ's time---who thought that the observance of the Law[s] would save them.  

Only following, imitating Christ will save.  It is Jesus who stated, "I was hungry and you fed me, thirsty and you gave me to drink, naked and you clothed me, sick and imprisoned, and you visited me."  Matthew learned from Christ well, because I cited this from his Gospel passage [Mt. 25:35-37].