I strongly subscribe to the idea that extraordinary claim require extraordinary evidence. Your reasoning also suggests that LCH should be shut down and dismantled immediately, because of the prospect of destroying the Earth or ending the Universe. Also that I should be a believer, because even if the chance is slight, spending an eternity in hell is not an option.
In order to take the "Mass Death" scenario seriously I want to see some credible indication that our environment actually is that fragile. What I do know (and again, I'm not a specialist) is that most catastrophes that actually happened in the distant past would be expensive for our civilization, but not "catastrophic". Worst case scenario would be something like making a 20 degree belt around the equator a desert, while at the same time making Norther Europe/Asia/America greener (or the other way around). Bad? Depends who you ask. Definitely catastrophic for the equator countries, but not for the humanity as a whole.
In order to take the "Mass Death" scenario seriously I want to see some credible indication that our environment actually is that fragile. What I do know (and again, I'm not a specialist) is that most catastrophes that actually happened in the distant past would be expensive for our civilization, but not "catastrophic". Worst case scenario would be something like making a 20 degree belt around the equator a desert, while at the same time making Norther Europe/Asia/America greener (or the other way around). Bad? Depends who you ask. Definitely catastrophic for the equator countries, but not for the humanity as a whole.