Minor quibble, the most likely "nuclear attack" is something like 9/11 by an enormously high factor. Very difficult to survive if you worked early shift in the towers in NYC, pretty easy to survive if you live in Silicon Valley, and most of the long term social problems were pretty indirect (dead and PTSD military personnel, political destruction of unrelated countries in the middle east, economic damage from the wars, security theater in airports, etc).

As the OP points out, there might be one or two issues with morale too.

> Sheltered from fallout radiation

It might be included in this, but you'd also want to have an air supply isolated from fallout.

Filtering air intake thru a HEPA filter is plenty good enough, fallout is dust.

> silicon valley has any bunkers?

Maybe.

During the cold war most people in the valley assumed they would die immediately if there was a nuclear war.

Those factories supplying America's war machines are now all in China, I wonder if SV is off the target list now.

Certainly hitting Oshkosh Wisconsin or Lima Ohio would damage the countries military capabilities vastly worse than hitting SV today.

Bunkers are the first things to be hit I would imagine.

Military bunkers, perhaps. Your bunker in your back yard? Not so much.

Formatting.

I agree. Surviving a nuclear attack isn't the problem. That's just simply a matter of luck of where you are at the time of the attacks.

Surviving the aftermath would require blood, sweat and tears.

When civilization ends and humans are thrust back into subsistence living, we are essentially back to tribalistic animals having to endure rampant starvation and disease. Life is going to be hard for everyone, but especially those without tight groups/tribes and without arms.