In case of MH370 disappearance, Malasyian Airlines showed great degree of incompetence. Now they let their MH17 to fly straight through this dangerous war zone where fighter jets and SAMs are active all over the place. Why? To save some fuel. How brilliant. So no, I wouldn't say its 'a coincidence, that company is horrible.
In my opinion, the MH370 disappearance was swiftly covered up by many governments. I find it impossible to believe that, with current technology, a plane carrying so many people can just disappear off the map. There's plenty of Satellites monitoring and filming the earth, something that big simply cannot "disappear".