Well it is true that Vira came to tell Kunal but Siddhi had no idea about Vikram-Rohit fight.
It's not that Siddhi directly accused Vikram of murder. She went and asked him isn't it true that Vikram was actually there and he met Rohit same night? There Vikram was also rude saying yes I was there and I killed Rohit, that's what you want to hear??Come on, he should have understood Siddhi's situation at time. She is bound to act impulsive. How is she going to feel when she finds all these out after going through so much. So her behavior was justified. Initially she did think Vikram can never do such thing. Even Raveena was at the hotel with Rohit's cellphone, why was she there to get it? So all these things put together gives Siddhi enough reason to say Vikram is involved. So I wouldn't say she jumped the gun and didn't allow Vikram to explain. She sure was angry and that's why her approach was harsh; but Vikram too jumped it by saying yeah I killed him, that's what you want to hear, right? and that is why Siddhi raise doubt on Vikram's intentions for bailing her out and much more. She was more angry as we all expect better from Vikram, he's the reason I use to tolerate dumbo.Besides it seems very unreasonable on Vira's part to think their fight may not have any relevance to the case. Rohit supposedly died right after the fight. So here Kunal-Siddhi are being charged and they keep quite. And what was the reason, Raveena's honor. Of all people Kunal and especially Siddhi would sure understand and trust Raveena (God/CVs only know why?) that it was all trap by Rohit. So that excuse didn't quite made sense to me.Given time I may get calm on Vikram, I don't know when but I too hope I do as not many characters left whom I can like. I felt if there was no apology exchanges between SINAL-Vikram; that would be more meaningful. It coudl've shown how strong the bond is and they don't require any formalities. Everyone understanding it is just bad circumstances. For me this business of apologies spoiled few things.If anyone who is responsible and must apologize is dumbo. For the love of God, I can't stand it.