Sure, they wouldn't have known the specifics.
And things are now likely more fantastic than they imagined.
But still....they were able to observe change during their lifetime,
so I presume they'd expect it to continue.
So you say.
But
@oldbadger looks pretty threatening to me.
Anyway, we do face threats from others, eg, China, Russia, ISIS.
We've been fortunate.
But we shouldn't get complacent.
(Although some sore losers from the last election ought to calm down.)
This is where we have fundamentally different weltanschauungen.
I oppose giving up the power to revolt, which would be to give our government too much power over us.
I don't think we're made safer by being made impotent, & depending entirely upon government to
protect us from bad guys. That's weak, & it doesn't work....cops don't protect us....their job is
making chalk outlines
after the crime.