[alexandernst]

There might be a slightly modified version of this question which might actually make sense: "Why we don't shoot nuclear waste into the Sun".

Surely, the cost of storing that type of waste here (on Earth) is very expensive, both from economical perspective and from risk management perspective. It could be very interesting to compare the costs of sending 1kg of nuclear waste into the sun (or out of our solar system, if that makes it cheaper) compared to storing 1kg of nuclear waste anywhere here on Earth, + adding the cost of the infrastructure that is required to actually store and preserve that waste, + adding the cost of people that are required to protect that infrastructure (a facility of some sort), etc...

[08-15]

No infrastructure or crew is required to "protect" the "infrastructure" around a glass log on the ocean floor for the ~500 years it takes it to become as radioactive as natural uranium ore.

Why don't we discuss this easy disposal option seriously? Why do we instead ask seriously about launching it into the sun instead?

Because nuclear waste has been politicized to such an extent that most people have no idea what it is composed of, what the halflifes of its constituents are, how radioactive it is, how chemically reactive it is or even what state of matter it is in. But everyone knows that, like, it is, like, totally dangerous!

[dariusj18]

Because a catastrophic failure of a launch would be very bad.