I can understand authorities want to increase safety, I mean: Many of us have seen what even a smaller LiPo pack may do once it combusts, either on video or right in front of them. The same counts for chemicals, of course, they can be dangerous...
...However (pretty much as you would expect from government agencies), they're tackling the problem the wrong way: There seems to be a perception that making something unattractive and expensive will make things safer. But what it boils down to is not how much capacity you're carrying around at once, but how you handle it! It would be good if they taught people at post offices a basic perception of safety so this type of goods can be monitored by individuals. If you'll let them judge based on the scenario that they'd be in the same vehicle as that cargo, their judgement won't be too clouded. Trust the individual every once in a while.
Let's just say the authorities are running wild and becoming paranoid on whatever drug they're consuming (too much of statistics, tables, ranks and regulations if you ask me)