Assume your optimal dread—there is no moral reason not to kill others, with or without an advantage to yourself. There remain legal reasons not to kill others. Prison is living a long time repeating each day largely like the last, which you have identified as undesirable. It is practical and efficient not to kill others, and that is sufficient reason not to do so.
So you would kill people if you were sure you wouldn’t get caught?
So you would kill people if you were sure you wouldn’t get caught?