The first one: It is a matter of no consequence whether South Ossetia is a part of Georgia or not. It is a matter of tremendous consequence how people live in the whole region regardless of borders.
The second one: Russia is determined to show how powerful it is again in a way that other countries will recognise. It would be good to find ways to let this expression be made that do not involve endangering or killing people.
The third one: The choice of means offers a pretty good sign of who is in power in Russia. This will not make anything easier, and a strategy of confrontation will only confirm their power.
The fourth one: The Georgian government calculated badly in tying its foreign policy position to the United States. As convenient as the US may have found it to have a client in the region, it is not going to challenge a regional hegemon or take any other risks for its client's sake.
The fifth one: A lot of people in the US and Europe will find it hard to resist the tasty new Cold War bait that is being offered. This would make a few arms manufacturers happier and wealthier but would not help anyone else. If nothing else has become clear over the past seven years, it is that a failure of diplomacy cannot be covered over by an excess of belligerency.