Well, imagine you've been going through a lot of hardships, but your core drive to love and protect your family is what kept you going despite all the suffering and exhaustion this caused you.

And then you learn this core drive is fake.

Perhaps you wouldn't throw away your goal - after all, it still feels like yours, and you have nothing else to slot in quickly as replacement. But all the accumulated frustration and pain, barely held back by you thinking "it's worth it to protect and love my family", could suddenly become a second source of drive - much more energetic one, just asking to be unloaded on those aliens as punishment.

"Whether or not my own heart is truly mine or just a fake, I can figure out later. But what they did to me is unspeakable, and now they will pay."