This attitude is related to the belief that matters of lesser urgency are not worth considering. For instance: you shouldn’t bother worrying about, say, art in schools, because it doesn’t really matter anyway on account of climate change.
A friend who has a PhD in Rhetoric tells me that these are examples of the fallacy of relative privation. The Wikipedia entry for this fallacy notes the British neologism whataboutery. I can’t imagine a better word for it.