Leaving aside the reductionism, the difference is that we are already seeing the effects of the "bad weather" and we all lived through [1] (and, to a point, are still feeling the effects of) the "flu". No "ifs" about it.
There's no need to worry about a threat that has been theorized for 70 years (and may very well never happen) when there are actual, real catastrophes happening right now.
[1] Well, except for those who didn't make it through. They are not here by definition, but their memory is still fresh.
Leaving aside the reductionism, the difference is that we are already seeing the effects of the "bad weather" and we all lived through [1] (and, to a point, are still feeling the effects of) the "flu". No "ifs" about it.
There's no need to worry about a threat that has been theorized for 70 years (and may very well never happen) when there are actual, real catastrophes happening right now.
[1] Well, except for those who didn't make it through. They are not here by definition, but their memory is still fresh.