It's possible that they think they are doing good things according to their moral framework. There are hundreds of millions of people with truly insane moral frameworks.
It's possible that their particular job was, as far as they know, doing good things according to most moral frameworks.
I have strong doubts that everyone who kills people by clicking on them on a computer screen thinks that what they are doing is wholly compatible with their personal moral framework. Presumably, some of those people feel very guilty about what they do.
It's possible that they think they are doing good things according to their moral framework. There are hundreds of millions of people with truly insane moral frameworks.
It's possible that their particular job was, as far as they know, doing good things according to most moral frameworks.
I have strong doubts that everyone who kills people by clicking on them on a computer screen thinks that what they are doing is wholly compatible with their personal moral framework. Presumably, some of those people feel very guilty about what they do.