I mean, neither can I, but there's a difference between appropriate hostility and even Tracer, who, I must state again, cheerily mocks a WALKING WAR CRIME, going all out and essentially demanding her death(The only other person she really reacts negatively to being Sombra, telling her to go disappear forever, in a conversation about teleportation tech, which Sombra apparently stole. This is Tracer, who -knows what that means- talking.)
And....that argument is sort of in incredibly poor taste imo. As stated, she was not willing. That orphaned cancer patient willingly broke those heirlooms and thus -is- wholly responsible. Now if this was a debate about Sombra, then it would fit perfectly, but here...not so much.
Now, I may take her backstory into account, because it MUST be taken into account. Look at it this way, with the argument that is being used for Amelie being held fully responsible for events that are not in her control, those being killing Mondatta and potentially kicking off World War 4 and harming Tracer, who like Ana, was an -enemy combatant-, then I could demand we lynch Bastion for doing more or less the same, he wasn't given a choice in fighting humanity*, he was built, programmed, and shipped off to war like a B1 Battledroid. He's almost certainly killed people, or injured them, or maimed them, so he needs to die.
Until such a time as she breaks free of Talon, and makes her own decisions, taking all that consideration and just throwing it out the window because of who does what or hurts who is...wrong, plain and simple.
*As far as we know. It just says they turned on and then killed things.
Hey you remember that time Chu and company made Tracer a traitor(Albeit with the best of intentions)? Good times, right?
https://www.youtube.com/watch?v=lcRkaouAP9U This is the short. Despite my loathing for it, especially now, it was sorta cute. Until HE arrived.
tl,dr on plot: Cookies for Santa, Reaper wants a cookie, Tracer stops him. He gets one FROM Santa.