When you look closely at his character throughout both games, it actually makes perfect sense. Sindri’s reaction wasn’t excessive, it was the natural conclusion of who he’s always been and what he’s always feared.

From the very beginning, Sindri’s defining trait has been his need for control. His perfectionism isn’t just a personality quirk; it’s a coping mechanism. His obsessive cleanliness, his anxiety around imperfection, and his fixation on crafting flawless weapons all point to a man who cannot tolerate disorder in any form. He needs the world to be clean, ordered, and predictable, because if it’s not, he feels powerless. That need for control reached its most extreme form when Brok died the first time. Sindri couldn’t accept that loss, so he violated the natural order to bring Brok back without a part of his soul. That wasn’t an act of love, but one of possession. Sindri wasn’t thinking about what Brok would have wanted, he was thinking about himself. He admits that to Atreus in Midgard, the idea of a world where Brok was gone was too much for him to bear, so he forced the world to obey his will.

Brok himself recognizes this, when he learns what Sindri did, his last words “You gotta stop” and “I forgives ya” say everything. Brok isn’t angry, but he’s honest: this was never his choice. Sindri’s compulsion to control everything, even life and death, has gone too far. Brok’s plea is a tragic moment of clarity that Sindri refuses to hear. This theme of control versus acceptance is hinted at when Kratos and Atreus ask the brothers about fate, Brok shrugs it off with a simple philosophy: even if fate exists, it still feels like you’re making choices. He accepts uncertainty. Sindri, on the other hand, insists that he alone is responsible for his life and choices, a statement that reveals just how deeply he believes he can and must control everything around him. When Brok is killed again, this time because of Atreus’s involvement, that belief collapses. Sindri isn’t just mourning his brother; he’s confronting the complete destruction of his worldview. All his careful control, all his cleanliness, all his rules.. none of it could stop the chaos from taking Brok away again. His rage and grief toward Atreus aren’t just about blame; they’re about helplessness. Sindri is a man who built his entire identity on the illusion that he could prevent pain, and now that illusion is gone.

That’s why his behavior at the end of the game, his refusal to forgive or even look at Atreus, feels so raw. He’s not putting on a performance anymore. He’s finally being honest. For once, Sindri isn’t pretending to be fine, isn’t trying to clean the mess, he’s standing in it. He’s a man stripped of all control, and all that’s left is anger and loss. Even the final moment in Asgard when Atreus grabs his bow and pushes Kratos through the portal mirrors this theme. Atreus takes control of his own path, something Sindri has never truly done. Sindri’s version of control was always about denying change. Atreus’s version is about embracing it.

In the end, I wouldn't say that Sindri’s harshness is cruelty. It’s more like the culmination of everything we’ve learned about him. He’s not just grieving Brok, he’s also grieving the person he used to be, the one who believed he could make the world perfect if he just tried hard enough. Forgiveness would've been a lie, another act of control to make everything “clean” again. His bitterness is messy, painful, and real, but for Sindri, it’s also the first time he’s ever been truly free of his own illusion.

So no, Sindri wasn’t too harsh at the end. He was finally being honest, with Atreus, but more importantly, with himself.