This take always rubs me the wrong way because it conveniently ignores the fact that letting 90% of humanity die is wrong and should be avoided given that 1% of humanity is more or less to blame for this mess.
If one is going to use a word that means a specific thing then get annoyed because that word didn't conform to what they wanted it to mean, I mean, can we do anything about it? They should have used a different word. Calamitous or monumental are good words for what you're describing.