Oh we're aware of it.  But we're also smart enough to know there's precisely sweet eff all we can do about it if a nuclear bomb detonates.

When's the last time you had a nuclear attack drill?  Any idea where the nearest civil fallout shelter is?  Do you have your go-bag/bug-out bag/3 day's worth of supplies in a two-foot-thick lead lined container to protect from radiation?  How about a faraday cage so your electronics don't get fried?  An underground potable water source?  

No, huh?  

Well, good.  Then do like the rest of us: bend over, kiss your butt goodbye and hope you die in the first attack, because the lingering death afterwords will be no 'live' worth living.