Yes, love can save humanity.

"Ms. Ritsuka, listen to me. I refuse to travel to this world, get the simulator, and use my love to save the Lostbelt."
"It's not because I reject love. On the contrary, I think love is really great. I'm not saying anything broad and praiseful, but I really admire it."
"Because of love, piercing the light body, breaking the sky wheel with a sword, shooting down the starship, slashing the void with a knife, blocking people and artillery with a shield... these events that are exaggerated to the point of being absurd and can even be called miracles will happen."
"Because of love, beasts persecuted, crossed, and abandoned by humans continue to be born, challenging pan-human history."
"It is precisely because the power of love is great and heavy that I refuse. After all, my love is not broad enough to love everyone."
"If that's the case, then why do you still want to cheat on people's feelings, Mr. Scumbag?"
In the cage, Charles, who was covered in shackles, looked at Skadi outside the cage who was making ice cream for Surut, Caster who was serving tea to Ba Vanshi, Tlaloc who was sharing dessert with Kukulkan, Ibuki Douji who was exchanging tea ceremony with Minamoto no Raikou... He felt their gazes that shared the same hatred for the enemy and blinked innocently.
"Because the simulator doesn't say you have to use my love, Ms. Ritsuka."