1. Throwing someone in prison for life, or for any length of time, is violence. If the confederation was willing to use extra legal means to defend the deathly regiment, then extralegal means are necessary to stop it.
2. Diana went out of her way to make sure that Alexandra knew about Livia, and the cause of the crash was a freak swarm of owls. We know that Diana has a spell that conjures a swarm of owls from her fight with Thorn and she is the only one we have seen use the spell or any other Owl-themed magic. Since Livia was the only means Alexandra had to save Bonnie it was fairly predictable that she would try to call her in, which predictably led to Alex learning of her true parentage, which adds up to Diana setting up the whole thing so that Alex would find out. Why? I don't know.
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2. Diana went out of her way to make sure that Alexandra knew about Livia, and the cause of the crash was a freak swarm of owls. We know that Diana has a spell that conjures a swarm of owls from her fight with Thorn and she is the only one we have seen use the spell or any other Owl-themed magic. Since Livia was the only means Alexandra had to save Bonnie it was fairly predictable that she would try to call her in, which predictably led to Alex learning of her true parentage, which adds up to Diana setting up the whole thing so that Alex would find out. Why? I don't know.