Well just for arguements sake technically for the Lord of the Rings that wouldn't work because it was said that Sauron designed it so that no one could willingly throw the ring into the lava not even Sauron himself in case he got taken over by another being. Isildur having the ring was kind of an impossible choice for Elrond, as just being in it's presence was heavily affecting him so even if he tried to push Isildur in to lava with the ring, its power would feed on the conflict even more and make him take it for himself and make the situation even worse as he is a powerful elf and Sauron could use him as a loyal subject to revive almost instantly. So they couldn't destroy the ring willingly it had to be by accident, so we get the rest of the story in a plausible way.
But yeah a lot of 'modern' storytelling omits even plausible excuses and just does whatever even though it makes no sense.
By the way never though I would be delving into Lord of the Rings lore right here.