1. They didn't steal anything, they didn't force anyone to buy lemonade, they didn't violate anyone's property rights.
2. Setting up store in the vicinity of a place that attracts large crowds is just good business sense.
3. A government official who threatens to fine you if you don't close up shop or a government official who immediately fines you is the same thing. Didn't you Americans celebrate the signing of the declaration of independence yesterday? ... life, liberty and property?
