Fission waste is stored in pools and dry casks and never hurts anybody during normal operation.

Right. During normal operation the risks are minute, but what about threat scenarios outside of normal operation? Starting on page 112 here's a list of possible threat scenarios as compiled by the Fraunhofer institute: https://www.isi.fraunhofer.de/content/dam/isi/dokumente/ccv/2013/ETTIS_Deliverable_4_4_Catalogue%20of%20Threat%20Scenarios.pdf

Coal waste is belched into the atmosphere 24/7 and contains many bad substances aside from the radioactive ones.

That's also true. But again, being in opposition of using nuclear power plants as long as there is no long term storage facility, does not mean I'm a coal proponent. Coal will be phased out in 2038 and the idea is to build 40 green hydrogen power plants, to enable the transition. There will be no new coal power plants build in Germany according to the current plan.