Wamena is a damn site tougher place to land at than Denpasar for heavens sake - only 1800m long or thereabout and in the mountains
I think you can expect Indonesia to have a higher average rate of incidents & accidents than most countries - a lot of the airstrips are VERY basic, they are in some horrible locations and the infrastructure for radar, weather etc etc is spread very thin
Unfortunately, because of the size of the place and the fact that it's all islands means you really have to fly (and anyone who has been on Night Bus from Bandung - Jakarta will tell you what fear really means....)