There are always cut off points for medals, and people will always find a reason to be grumpy about this. The issue is that the MOD is perenially stretched for cash, and the cost of minting and more importantly hiring enough staff to handle the backlog of claims and ascertain eligibility is a not insignificant amount of cash.
If the lack of the medal annoys people that much then buy one privately - no one will stop you. The best way to look at it is some you win, some you loose, but its probably not worth getting too grumpy about. Enjoy the cash saved by not having to get it remounted!