Couching this in terms of Japanese culture is unhelpful in my opinion. The return gifts probably wouldn't exist in the first place elsewhere, but allowing them is simply a blatant loophole that various local governments have cynically abused to increase their revenue and this is something that would happen in any country. The biggest problem is that some local governments are apparently giving return gifts that have…
Is there a Western government that isn't set up this way? You could write this same blurb about the United States. I would be very curious to hear about what happens when rural areas have political power consummate with their population instead of with their land area or with the mere fact of their historical existence. (For example, does it look less or more "fair"? Are there unexpected consequences, like maybe further depopulation of rural areas?)