I mean I wouldn't be cool with someone assassinating Oppenheimer or any of the team that worked on the U.S. nuke which was clearly meant as an offensive weapon

I mean I wouldn't be cool with someone assassinating Oppenheimer or any of the team that worked on the U.S. nuke which was clearly meant as an offensive weapon from the very beginning (even though I could sympathize if it was a Japanese time traveler). AFAIK the U.S. is still the only nation on earth to ever use this weapon of mass destruction. Claiming that the own nuclear arsenal is defensive while the empirical evidence suggests otherwise is a pretty strange notion. If the going gets tough, the U.S. is probably going to use nukes again. Hopefully it won't get that tough. I'm not even sure how you can use a nuke defensively. Kill them all first because they kill us...I guess it could be argued to be defensive technically.