It's complicated but in sum we needed to get some dangerous information away from a) an AI looking to grow and learn from it and wipe all organic life from existence and b) people who couldn't be trusted to keep it from happening again should we supersede the odds and be successful in stopping it this time. It could not be deleted however hard we tried. So, opportunity presented itself through my mother's life's work and I lead the Discovery, where the information was stored, through a wormhole into the next century.
[Captain] We all do when such a thing happens, but there's a line of logic he very clearly crossed. I punched the man who was responsible for my parents' deaths, I told him it wasn't over, but he had a much more direct part in their demise. As in, his carelessness made them an obvious target and he did not warn them either. That is nothing like trying to stop a natural occurrence where several different variables are to be considered.