The other side of the issue is that the much-praised "first principles thinking" breaks down fast as soon as someone thinks they understand something they don't.<p>I like to consider human reasoning a point of failure like anything else, and plan to avoid single points of failure.<p>Don't tell my why you're right, tell me why you think the plan would still be safe even if you are wrong.<p>Don't tell me your attachment is secure, tell me there's a safety cable. Don't tell me what encryption you use, show that your actuators physically can't trap someone even if hacked.