"lot of westerners use Indonesian domestic flights without any warning from their country,"
welllll - there isn't any choice TBH
I think you'll find most expats are fully aware of the risks - tourists to Bali may be less so but then they often arrive on international airlines anyway
I'd guess the risks are roughly the same as flying in the USA or W Europe in the 50's and 60's TBH
but if you're going up-country to a small strip............ especially in Indonesian Papua - you are bush flying with all the attendant risks