This is usually said by people that do not know all cost.
They assume that all cost excludes their own life, the life of those they love or the entire world.
I am wary of such people because they dig in on sunk cost, not willing to let go of a sinking ship, because they have invested so much in it. Unfortunately, they take many people down with them.
Nothing is worth all cost, even though everything has a cost.
– Osasu Oviawe