At least not all of us will see that world come to pass. Many of us will perish in its throes and their aftermath. At least a third. Regionally maybe more. And of those who survive the tribulations, half will lose their minds in the ordeal. Just can't deal with the radical and terrifying changes the world will undergo at all. The sheer amount of death and destruction everywhere, the loss of most modern amenities and safeties people tend to rely on. No more medication or stimulants to keep those inner demons at bay.
Might have to be institutionalized or put out of their misery. Can't really feed or care for that many crazies. Most will probably just starve, off themselves or go feral.

But for those who do and still have the capacity for it, there'll be plenty of opportunity and need for righteous, corrective ultra violence.

In fact, the warrior and protector will be in high demand everywhere in these times and held in high honors. And there'll be plenty of grim work for them.

It'll be a time for heroes, adventurers and pioneers again until the world has regained its footing and civilization has been rebuilt from the ashes of the old.