Any ACT OF WAR against humanity, Nations, Civilians is really too bad to call ourselves Human. I would like to un-invent weapons of mass-destructions and all other tools which kills !!
Now, if you ask me ONE SUCH INCIDENT in my life, which shocked me and changed my outlook towards life, is : 26/11 : The Terror Attack on Mumbai
since, I live in Mumbai and in 2008, November 26th was a horrific day.. .most the place where this attack took place is just within 500mtr to 2kms away from where I was !! Horrific evening followed by 3 days !!
The attack on Mumbai shocked the world. For three days terrorists wreaked havoc over multiple venues in India’s commercial capital, leaving a trail of blood, death and destruction.
This attack happened at Cama Hospital, the Chatrapati Shivaji Terminus and followed the three-day siege at the Taj and Trident Hotels and at Nariman House.
READ Details on : https://en.wikipedia.org/wiki/2008_Mumbai_attacks
GoodSoul.in 
I feel I have absolutely no right to judge how much fear one had to experience during any such incidents.
Theoretically:
We need to kill microorganisms. Vaccination is just that. Vegans also live on plants. Living, struggle and violence.
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