The reason the Dutch and Malaysians are so "mature" about their response is they know there's absolutely nothing the countries can do about it unless the where prepared to send troops in to secure the area.
Now we know thats not going to happen, so they may well just show some dignity and see what they can do.
The question is what level of investigation is needed in this instance, and hence what security? If a complete forensic examination to determin the cause is needed, then nothing short of a professional force be it local police (funny) military etc.
Now, if we know what bought it down, then really all that matters is recovering the body's. That could be a lot simpler. The problem here is determining all the various interests and hence the resistance to particular actions.
Depending on how and what bought it down, will determine the action of those who did it and the need of a cleaning operation before any of the "other side" get there.
So the real fact is it was probably just a
up, and almost every one knows it. Hence some people are just accepting the fact, and others are using it. Another words the innocent are in the middle again, situation normal.