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That's up to Andre. If he makes better choices in his life he may stop selling stuff on the street corner.

Go after the buyers. Word gets out that if you buy from Andre you get hassled by the law and Andre's money dries up.

They could put a police officer right next to him on the street, that'll keep the customers away

Or confiscate Andre's stolen property and give it back to the retailer. In cases where that's not apparent who the retailer is, give it to shelters.

Why does Andre make bad choices?

Because, as of yet, there has been little penalty for making bad choices

Really? That's it? Bad choices are made by default?

How did caveman society ever survive without a strong police force?

Before police there was mob justice, lynching and exile(often a death sentence)