It's a phenomenal question, and I think it's cool that you are having what I call "strategic" (that's to say, long term) conversations with your kids. I'm trying to do the same with my three oldest (two stepkids, for whom this kind of thinking is almost completely foreign, and my natural daughter, who's a chip off the old Stadler block in this case).
I struggle though; the world goes in cycles. Advancements are made, and yet at times we backslide. I think this moment in time will ultimately be judged in terms of the reaction and the backlash to it. I think it's easy to look at a month, a year, a Presidential term, and think it's going to resonate in all it's glory independent of what happened before and after, and that's a mistake. Was Bush, Jr. a good or bad President? In the context of Bill Clinton, probably not good. In the context of Obama and Trump, the answer is possibly not the same.
I would like to think this age - characterized by an unprecedented leap in technology - will be seen for what I think it actually was: objective, scientific advances that far out-paced our psychological capacity to keep up. We are the teenager that just got their driver's license, and doesn't quite know what to do with it yet. I think along with your nuclear example (and you can use the industrial revolution here as well), our social media will be seen as an advancement that we didn't react to fast enough. I would hope that the future is kind to us; kinder, perhaps, than we are to our past, and would recognize that many of us - not all, but many, even those we don't agree with - did the best we could with the tools we had. I know for me, I would hope that in 30 years, mental health wellness will be as common as treadmills and diet books, and we will be generally more equipped to handle these changes that I would imagine are still coming at a rapid fire pace. That in and of itself will color the assessment of our current state, much like advancements in virology and bacteriology color our assessment of, say the late 19th century, or the early 20th century.