Everyone hates Arnab's guts, because his channel has the highest TRP's and has been the number one news channel for a long time now. All the intellectuals can keep cribbing about his 'yellow journalism' and what not, but fact is that the majority of India loves him.
Whatever his agenda might be behind pursuing this case with such dogged determination (and I do believe he has an agenda), the result is a good one. He managed to keep Sushant in news for more than 40 days after his death and ensured that enough public pressure was built, so that CBI took over the case.
This might not suit Rhea, her team, the Mumbai Police and the Maharashtra Government, but it suits everyone else.
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