It's because journalism as a profession in the west is more about propaganda and manufacturing consent for the ruling class than it is about getting at the truth or reality of a situation. Their opinion is the only part that's actually necessary or relevant to their purpose. Any "investigation" they do is just a garnish to legitimize whatever narrative they're being paid to propagate. Why would they ask questions of people whose answers will probably contradict that narrative? It is clownishly unprofessional, but for a number of reasons, including just the sheer volume of "news" vying for attention, it's become less and less needed recently to provide that pretense of doing any investigation.
It's because journalism as a profession in the west is more about propaganda and manufacturing consent for the ruling class than it is about getting at the truth or reality of a situation. Their opinion is the only part that's actually necessary or relevant to their purpose. Any "investigation" they do is just a garnish to legitimize whatever narrative they're being paid to propagate. Why would they ask questions of people whose answers will probably contradict that narrative? It is clownishly unprofessional, but for a number of reasons, including just the sheer volume of "news" vying for attention, it's become less and less needed recently to provide that pretense of doing any investigation.