Whatever they do, they will face backlash. Akshay posts a video, he was trolled, he launched the FAUG app, he was called a thief and killer, GoQii released a press statement denying the rumours, again they faced backlash.
Salman posted one tweet, he was trolled. Aamir didn't post any condolence tweet, even he had to face the brunt.
People are arrested for spreading fake news and here again people will say that Anti Hindu Liberal gang is behind this.
Whether the actors file a case or they reply to these trolls or just ignore them; there will be 1000s of fake accounts that will be created to bring them down, irrespective of what the actors do. It is just a paid agenda and its sad that genuine Sushant fans aren't able to get any sort of justice, whether murder or abetment to suicide.
Regarding the last statement about "Khan" gang, whoever speaks up will be called anti-Hindu, anti-nationalist, ISI agent and what not. Let the theatres open and the bigger films release and all this should reduce ideally.