1. The problem is not being raided for tax evasion. The problem is them and others being investigated/raided after criticising the government. It's the usual "we'll ignore things if you keep things quiet and make your life hard if you don't". No one is above the law, but the application of the law is very selective... Any journalist or org will get the message.
2. You want a 2 hour documentary that covers who did what, who did it first, back it all with believable proof, and also cover 800 years of nuance, interpretations, opinions... yeah, good luck with that. It's not going to happen.
There are indications of what happened and how some didn't do anything to stop it from happening. Pointing this out isn't an attack on India or Indians (there's a difference between you and the government/politicians). It is what it is, no need to be so defensive.
The funny thing is that no one really cared about this until the Indian government decided to censor it (why?) and presented it as an external attack (well, now I'm interested!). They decided to make a big deal out of something than only they actually cared. Now apparently the BBC is the "most corrupt organisation in the world" (to quote a BJP spokesperson) and raids are needed because, of course, "no one is above the law".
Be it India or another country, this is bad and shouldn't be defended or encouraged.