“Do your own research” is a phrase with a lot of baggage. It means more than doing your own research.
It’s a phrase that has been used online in debates over every kind of conspiracy theory, religious idea, or political stance and carries with it the unsaid presumption that alternative sources are the key to learning the “actual truth.” It’s a loaded phrase that acts as a calling card for people who are overly confident that they have the right answer but can’t articulate how they arrived at it.
I roll my eyes whenever I read or hear someone say “do your own research” because I know the debate ends there and there’s no convincing them otherwise.
Inspection intervals are based on expectation of damage over time, not to verify if the installation procedure was properly followed.
Design requirements for airplane parts that experience rotation or are part of control systems are regulated to have locking features to prevent loose bolts from happening. If the initial installation was done improperly it could be a failure in quality control at Boeing. Or if they were installed properly but weren’t designed with sufficient locking mechanisms it may be an improper design. Either way this could turn into an Airworthiness Directive which is when the FAA steps in to ensure safety.