And if we did turn off the electricity, get rid of the cars, and so on, what would happen?

Even more people would die.

No hospitals, no heat, no emergency services, and all the other things of modern society that have increased our lifespan from 40 to 70.

People die as a consequence of the many things society produces.
But, it seems, more people are saved than are killed.

Therefore, if we wish to reduce human death as much as possible, turning off the power, turning off cars, will not be much of a solution.

Shortening of a certain number of lives is an acceptable price, for saving even more of them.

(Well, yes, it's probably not too hard to poke holes in this argument, but, it's a perspective to consider as well.)