The person you're responding to is basically making the, "steal a loaf of bread to feed your family" argument. It's complicated by the fact that loaf of bread was already reserved for saving others,

That's a spurious argument here, though. This is like not buying groceries for two months, having the cash to buy groceries, then stealing a loaf of bread to feed the family.

These people shouldn't be there, they're on evacuation order, and they have safe routes to leave. Not one of their lives is in danger that they haven't chosen. But they did choose - to put their property ahead of their own lives, and in stealing fire equipment they're putting their own property ahead of the lives of fire response teams and ahead of all the other properties in the same area. They're willing to have the whole neighborhood burn around them, to cut off safe evacuation routes, all to try and save their own home.

but it's stupid to act like they're a deranged person without a point.

They're engaging in sophistry and misrepresenting the situation to try and make hindering firefighting efforts into something personally justifiable. It isn't.