Thieves are cutting through bike racks

Thieves are cutting through city bike racks and there seems no way to counter this, as any metal that can be formed into tubing and turned into a bike rack can necessarily also be cut with tools.

But people are making off with bikes that have U-locks on them. Those too will be cut off, but those stolen bikes are not being ridden away. There must be organized teams with tools and a truck – are the police making any efforts to identify them and track them down?