I think that children themselves are not wrong however, that does not mean that children cannot do wrong. If that were the case then juvenile detention homes and legal punishment for juveniles wouldn't exist.
Vinu locking himself in his room, not talking to people (inc Savi, so not the first time he hurt Savi), not going to school, isolating himself is not normal. This behaviour was also encouraged by a certain someone btw. None of his parents sat down and spoke to him about how to approach and communicate problems and he continues this behaviour even after Pakhi left. Again he closes himself in a room and does not eat till Sai comes. Savi on the other hand was always shown having a disciplinarian in Sai for lying or being mischievous.
I don't think Vinu was fine till pre leap. His issues started right from the Jadugarni track with a little encouragement from Pakhi and continued, with Sai trying to resolve it by giving him his complete family all the way till the end. It was never resolved.
Lastly, we can only try to understand Vinu from the lens of what is shown. Vinu walking away without looking back while Savi choosing to stay showed the difference between the two. I didn't find it unconvincing considering all that happened before.
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