How do you bring down an entire system?

Answer 1

thats an evil person....

Answer 2

With a virus, either biological or digital. Misinformation and conspiracy theories in addition to a virus. 

Answer 3

The best way is to disrupt the money. You need to define the system as a website system will be different from a government system.

Answer 4

Pretend like there is a virus

Answer 5

Have you never listened to Led Zeppelin? One brick at a time or with a wrecking ball. Either works.