there is also a precedent for hijacking the plane by the pilot with the intention to land in another country (happened just before the MH370), a precedent for hijacking the plane to request asylum in Australia and a precedent that it failed(as do most hijacks)
but the media just had to spread clickbaity articles about the "perfect suicide" so it got into people's heads and had the impact on their clear thinking as well as on the investigation process, now while there is a plausible possibility that it indeed happened so, the problem is that no other option has been taken into account