Anders has never made it out of DA2 alive, somethings are just too horrible and people have to answer for their actions.If he gave the orb to Cory knowing the death and destruction that would follow then my Lavellan wouldn't be able to let him get away with it. If he plans to hurt people to achieve what he sees as the greater good then she has to stop him even if it means killing the man she loves.
If he's goes to those extremes he's not the man she thought he was anyway.
Lashing out in grief filled anger is different from deliberately setting out to kill people to achieve a goal.
Well, I'm guessing he didn't plan on that explosion happening, based upon the conversation you have with him in Skyhold, after Haven.
Inquisitor: I would like to know more about the orb he carries.
Solas: As I said, that must be the means by which he created the Breach. I suspect the blast that destroyed the Conclave was more accident than anything. The result of unlocking power that had sought release for ages. What I cannot understand is how he managed to survive such an explosion.
Inquisitor: You said you believe the orb is elven?
Solas: I never would have believed a Tevinter mage could unlock such a powerful relic. It clearly enhances his abilities, giving him access to power he should never have known.
Inquisitor: Like the power to control the Archdemon?
Solas: Indirectly, one assumes. Nothing in any lore connects my people to the Old God dragons who became Archdemons.