This question already has an answer here:
What is it called when you're in an argument with someone about some relatively small thing, and they bring up an overarching out-of-your control thing that if things go wrong, the smaller argument is moot? Something something blah blah fallacy? It's on the tip of my tongue.
For example: arguing with a coworker about respecting personal space, and the one who doesn't care about it (trying to argue against the need for it for some other value like organization/cleanliness) brings up "well, if we don't have enough sales and lose our jobs and can't afford this office it's not going to matter!"