Using analogies to avoid dealing with the actual topic is not productive. ESR claimed that open source projects are inherently more secure because "many eyes make all bugs shallow". That is what we are talking about. Not cars, not airliners. His hypothesis relies on the (false) assumption that many eyes are looking at the code simply because it is open source. That is not the case, as obvious security holes like these demonstrate time and again. It takes dedicated, qualified people spending significant time auditing code to make it more secure, not being open source. A closed source project with 1 security expert auditing the code is more secure than an open source project with 0 security experts auditing the code and a million users downloading the source and compiling it.