Allowing it starts a race to the bottom. Playing city off city to bypass planning, get subsidies, preferential infrastructure. And that's assuming we know where all the money's going. That's the thing with local government; it's a warren of people you've never heard of waiting to be inappropriately influenced.

In the end it's only a multinational and a very local economy getting a boost. The public purse as a whole takes a very serious hit.

Remember that Amazon needs to build this stuff somewhere. They don't need a subsidy to achieve this.

That is not to say that all subsidies all awful, they just need to be managed at the level where the people getting the benefit are the same as those paying the price.