Heat of lava does not destroy radioactivity, and volcanoes shoot stuff into the air, where it forms dust clouds that rain dust over thousands of miles. Nobody wants that dust to be radioactive.
Stuff in space is technically safe, but getting it there is very expensive and risky, and even if you get it there, somebody can steal it.
You cannot get any more useful energy out of spent fuel, but you can use it to make nuclear weapons. So you really do not your nuclear waste floating in space where anybody can grab it.
it is perfectly safe store nuclear waste underground in earthquakes-free area, or even in building that are safe from natural disasters. Which is way cheaper and easier.
The hysteria about nuclear waste is kinda like hysteria over GMO, or vaccines, or 5G.
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