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makes the shopping experience shittier for the rest of us (locked merchandise)
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the syndicates fencing these goods use the money to support actual harmful crimes
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the people doing the thieving often get violent themselves
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raises prices and causes store closures
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people don't want to work in shitty stores, so the workers they have do the bare minimum (again, worse shopping experience for the rest of us)
The bazaars where people sell the stolen goods also cause lots of problems.