This is exactly what I don't understand about people who want peace in Ukraine as soon as possible and at all costs: capitulation for the sake of short-term peace endangers long-term peace.
If we globally set the precedent that you can invade whomever you want and win just because you have nukes, that makes for a vastly more dangerous world. Every country with nukes will suddenly be more willing to go all imperialist, and all the countries without nukes will want to have them as a guarantee against invasion. And I don't know about y'all, but a world with way more nukes in way more hands is way more dangerous.
Plus, Putin has shown he'll keep on invading neighbors so long as he can get away with it. Delivering a crushing defeat to Russia and specifically Putin is the only way to achieve a more lasting peace.