In theory yes, but in practice you'll most likely to face the following issue: in space, people often are specialists. So what if the mechanic goes bananas, kil

In theory yes, but in practice you'll most likely to face the following issue: in space, people often are specialists. So what if the mechanic goes bananas, kills someone and then it turns out he is the only one with some in-depth knowledge of the engines and letting him out may be even more risky than keeping on board.