There's a slight difference between both quotes:
Katherine Jackson wants Conrad Murray to rot behind bars -- telling reporters outside the courthouse, the doctor's 4-year sentence is "not enough." -> tabloid reporters could have made up this quote, which is totally out of proportion.
Speaking to KTLA ... Katherine added, "Four years won't bring my son back" -- but she admits ... Judge Michael Pastor was extremely fair with his sentencing. -> this is a real quote from Katherine, because she actually said this on the video.
So... it is not so hard who to believe, is it?