We feed them and they hate us anyway.
There was a thread posted a couple of days ago in which some people in Australia were throwing food to a large lizard, and then freaked out when the lizard came up on their porch looking for the source of the food. The same factors might be in play here. We are throwing food at them, and they think if they come here, there will be much more in the way of goodies for them to feast on.