Honestly they kinda deserved to die because neptune and uranus kinda mostly care about themselves and not working together with the rest of the sailor senshi, i mean come on, they betrayed and killed pluto and saturn for NOTHING! They thought that they would kill galaxia only the two of them, serously those two really had to learn that its better to fight thier enemies together with sailor moon and the others. Im really sorry, but i didnt even cried on that scene, it doesnt mean that i dont hate neptune and uranus, it just makes me mad that they prefered to only work alone when they had sailor moon to help defeat galaxia. And honestly pretending to be evil and killing some of the sailor senshi was the most stupidiest, pathetic, and idiotic plan those two ever planned, pluto and saturn and the starlights and chibi chibi and neptune and uranus wouldve won by then when the inner senshi got killed!!! But no, they only wanted to work alone and yet they die. But it was great that thanks to sailor moon, all the sailor senshi and mamoru came back to life. And i just really hope uranus and neptune learned that lesson to never betray sailor moon ever again and this time fight with teamwork.