When I was living on the streets, I shoplifted on a regular basis. My justification for doing so was "they have more in the back", which is eerily reminiscent of the priest's argument about stealing from wealthy establishments (**although it did not say so in the article in this thread, the full text of his sermon shows that he only advocated stealing from big chains like Wal-Mart or 7-11, not small places whose business would be much more severely impacted by the theft).
Whether or not it's condoned by the church is irrelevant; people have been coming up with that sort of rationalization for years to justify their behavior, and they will continue to do so as long as they live in such dire straits. That's not to imply that all poor people shoplift-- there are a number of charitable organizations that give out food and other necessary supplies. Those places were a life-saver when I was homeless, and if it weren't for them, I suspect there would be a hell of a lot more shoplifting-- but like alxnjsh said, charities can't provide everything, so people are going to seek alternative avenues to get what they need.
Religion is actually very important for a lot of poor people, as it provides hope; however, when it comes to staying alive and providing for your impoverished family, all of that "thou shalt not steal" shit goes right out the window. People in need are going to do what they have to do to get by; this priest was simply acknowledging the reality of the situation.