Yes. They allow them. Because it is profitable to allow them. The jurisdictions that don't allow them stopped allowing them when it became unprofitable to allow them.
People have to fight the ticket, which means up to 3 or even 4 days of lost wages to fight a ticket that costs max $200. Most people won't bother. However, after you beat the ticket, the municipality that issued the ticket is now subject to a lawsuit. If just a very few people follow through on the lawsuit, the cameras get used for monitoring, not revenue generation.
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