But even with nukes - You can't just shoot a bunch of hot off the shelf nukes hundreds of years through space. By the time the nuclear material arrived it'd be massively degraded. You'd have to shoot your entire nuclear weapon production infrastructure to the Sol system, then process the nuclear material and assemble the nukes when you were only a dozenish years away. So now you've got not just a couple of hundred or thousand missiles, but the facilities to manufacture and install the cores for all of those weapons, the materials necessary to manufacture all the unstable fuel for those weapons, all kinds of things. So many of these ideas are premised entirely on fanfciful hyper-tech or just completely forgetting that stuff falls apart over long periods of time being bombarded by gamma rays.