Not while in the state is hysteria. You can't reason with a hysterical person til they calm down. 

Hysteria

exaggerated or uncontrollable emotion or excitement, especially among a group of people

You may have gotten yourself into a running-around-in-circles routine. He's already convinced himself we're all dead, it seems.

Ugh.... Probably. He'll just wake up tomorrow and go to work or school like any other day with no end of the world happening.

Dude we are vgcharterz... we are all screwed lol.

Sorta how I feel about teen pregnancy.  If we either demand abortions or adoption of any child born to a teenager with no way to support that child, the world would benefit exponentaly. Or we could give a vasectomy to every male child at birth and have a free reversal when that mature man is ready to have a family. Not a single unwanted baby ever born again.

I am in Australia. Or more specifically... I live in Mad Max country. It's already post apocalyptic... Whatever doesn't kill you, you can eat.

With that... I guess I am already sorta' prepared? Clothing wise I am all good with coveralls, firefighter uniform, army uniform, MX body armor, hunting knives, compound bow, boat, fishing rods and net, generators (became a necessity when electricity went out last year for a week due to a storm.), solar and so on.
Got a few large lithium battery's as well for storing solar power... And have an electric bicycle which can keep on going even when petrol for the cars/motorbikes becomes inevitably scarce.

The paranoid guy is clearly insane, he claims to come from "Canada" - which we all know was a fictional country originally created in 1997 by Matt Stone and Trey Parker for their first season of South Park.

Worst of all is his profile picture: a suicide bomber with delusions of grandeur. 

Most of what you're worrying about has always been here in one form or another. The difference is really in how the entire world is all connected via the internet and how the 24/7 news cycles keep pumping the shit into everyone's head. 

My advice would be to just put a self-imposed black out on the news. It's not easy, but it's a good idea. I did that for a few years and it was really refreshing. I found out just how much all of this junk really affected my day when it was removed.

Do you know what was an advice for population/military in USSR in case of nuclear war?

In what part of the earth's history was it that some of these events haven't happened yet?

Weapons of mass destruction? Dude. Imagine warfare back then when they were using black plague to destroy a city. Or you're not aware about that?

What we do is we thrive on the situation that's thrown to us. That's life.  No matter if some maniac has a button to vaporize a huge area those who surivive will find a way to live on. Wether the world breaks on us is just but one paragraph in the story of the whole universe. We are nothing too special. However our value maintains exclusively to be our own which is not a bad thing as that is how we preserve ourselves as a species.

Now if you want to say it's going to end now just go run up the hills and live there. But remember, time will always catch you and beat you.