>If immmigration is bad then you want as little as possible. It doesn't make sense as a goal to say you want to limit something you want to get.

People want food to sustain themselves. But, for a lot of people, limiting the amount of food consumed and picking healthy foods over junk food is a good idea. You don't want just "any" food, you want the food that will sustain you and will be good for your health in long-term.