>Is there really anything about them that's bad?
Everything. Major one is radioactive contamination, the effects of it are devastating and last significantly longer. The only other weapon on par with nukes are bioweapons, stuff like mirror life (and scientists appropriately reacted alarmingly to that as well).
The reason we have a mental block is because it deserves one. A quick skimming through https://en.wikipedia.org/wiki/Effects_of_nuclear_explosions and https://en.wikipedia.org/wiki/Effects_of_the_Chernobyl_disas... should be enough to convince you.
My family was in the zone of lower contamination when Chernobyl happened and after radioactive rainfall there were many instances of various cancers in people in the area. It is extremely ignorant to not have a mental block in anything regarding nukes.
I’m not sure if you’re one of the down voters, but I appreciate your comment.
I purposely took a contrary position in a debate just to spark a deeper discussion. Glad it has done that.
Mirror Bacteria is quite the terrifying prospect [1]. I'd never heard about it but the theory is that if we made a mirror bacteria, our and all other immune systems would be unable to defend against it, potentially leading to catastrophic infection of vast swathes of all life across the planet and the unavoidable death of some large percentage of all life. The benefit would be that they could be used in treatment as a chassis to carry other molecules into the body or that they could manufacture mirror-drugs that would have novel effects. Quite the addition to the torment nexus huh.
[1] https://www.science.org/doi/10.1126/science.ads9158