Ain’t no software that can jam thousands of volts into the USB port.
You no understand capacitors. ;-) https://en.wikipedia.org/wiki/Capacitor
You no understand voltage conversion. ;-) https://en.wikipedia.org/wiki/Capacitor
You no understand Amps. ;-) https://en.wikipedia.org/wiki/Ampere
You not so smart with electronics.
oh and you not so smart about transformers. ;-) https://en.wikipedia.org/wiki/Transformer
I can get a million volts from a 9v battery. Amperage is just going to be minuscule.
Think about it like this. You have a bathroom with a floor drain. It is fully capable of keeping that bathroom from getting flooded with all the taps running. The USB stick is a rubber membrane and you hook it up to a tap. It gets full and bursts. Flooded bathroom and 3/4th of the rest of your house. Water is an easy way to think about electron flow, be it push or navy pull.
Stuxnet? Siberian Pipeline Explosion?