I've just tried to capture piggies in 4 different streets in four different zones, and in each case, it failed, with a -30 mood hit, and the piggies had a word bubble that said something like: "No man, I don't want to settle down." A bait was removed from inventory in each incident.
Is this a new thing? Am I forgetting some crucial step? Do piggies just not love me anymore? ;)