We need to store the waste for thousands of years. This is bad. We are able to recycle the waste for more power but we're not allowed to because it produces a tiny bit enriched uranium and that's not allowed by the pact the US and Russia made. But recycling waste is tech from the 70's and it can reduce the half life of 100.000 years to 100 years.

Thorium however, is a different story. It doesn't work with gamma radiation but with alpha radiation. Alpha radiation is the most dangerous form of radiation, but it doesn't go far and doesn't go through many things. You can contain it with a piece of paper. Gamma radiation is the least harmful form of radiation but the big issue is it goes really far and goes through almost anything.

So waste from a Thorium reactor is much less harmful, easy to contain, also has a very short half life (I don't know how long but it's really short, as in several years) so Thorium really is awesome. Thorium is also a waste product of many other mining operations so it's already a form of recycling. The downside of a Thorium reactor is that it's far more complex than the reactors we know so it's very hard and expensive to build, more than a regular reactor. So it will cost a lot, takes a long time, but it's an extremily safe and wise investment.