> If not Amazon, another company will do business with gov. Face recognition is mature enough, there is no very high barrier. Even if US gov doesnt adopt such technology, another gov will do.

> It is just business.

Guns are a mature technology, and pretty easy to use. If I don't do the hit for Vinny, some other hitman will, so I might as well make some cash. It is just business.

The fact that someone else may perform a morally dubious action if you don't does not provide any justification for you to perform that action.