They're not chosen for high ethical standards. The things you mentioned are attributes of painfully normal/boring people, not people of high moral standing.
They're chosen for being the best at being square and following orders without dissent. These kinds of people are the least likely to speak out by definition.
The best at being square OR best at following orders. OR, not AND. I think they only tolerate the squares because we^Wthey can actually get the work done.
They're chosen for being the best at being square and following orders without dissent. These kinds of people are the least likely to speak out by definition.