Thai and Indonesian airlines due to low achievable ticket prices end up buying 20 plus year old jets that require careful maintenance. But these jets fly often with deferred maintenance work. They hire the least expensive and qualified pilots that money can buy. Fly in areas with often horrendous weather into airports that don't have the latest ILS equipment on jets that dont have the latest equipment either. The only wonder really is that they are not dropping out of the skies daily.
Very tragic loss of life here. But as many believe, the odds of such an accident were greatly enhanced by all the factors. Maybe its not really an "accident" then in such circumstances. Its an eventuality.