Because the bulk of the masses are sheep. In one sentence.

They would rather have someone spoonfeed anything to them and take it as gospel than critically think or report (in the media case) -- for themselves.

The masses are being dumbed down as we know and this is also a government sponsored program -- flawed on purpose in the schooling systems of today.

And all related, people do not wish to question things or authority and that is part of the education / conditioning systems also.

Those are my reasons, threaded together. You cannot separate them.