In what way do you think this overbooking protection will help you against the airline? They will still try to throw you off in case they think they need the space. The problem is the airline and the arrogance of big organisation thinking that everybody else has to back down.
Sorry, but I fail to see the connection between preventing overbooking, covered by one set of COC conditions and helping criminals and terrorists.
Are you implying that overbooking somehow prevents terrorists and criminals from flying, or are you claiming that a move to prevent airlines overbooking or, for that matter, stopping airlines from booting already boarded passengers for reasons other than that the passengers are, disruptive, intoxicated (as GMP explained when I worked at MAN, you don't need to be drunk to be intoxicated, just to have partaken of drugs or alcohol), unable to occupy a single seat or are deemed to be a threat to flight safety, will somehow prevent passengers being removed from flights for legitimate reasons?
The current discussion aims and making the removal of a passenger from the plane more difficult. I think this is not the right way to go. You can have an optional protection against overbooking of your seat, but in the end the crew must be be supported when they remove passengers for safety reasons, even if the crew turns out to be wrong.
Sorry, but I'm not buying that.
You are still equating the removal of a passenger who has been properly boarded, is neither a threat to flight safety nor falls within any of the other legitimate categories of passenger who can be removed from, or denied boarding, a flight with those who are quite correctly denied boarding or removed from the flight.
You appear to be advocating a situation in which crew can remove any passenger they like, for whatever reason they see fit, regardless to whether this is a breach of the contract entered into at the time the passenger's ticket was purchased, and that it should be up to the passenger, having meekly complied with said unlawful denial of passage / boarding, to then seek redress through the courts.
Not only is this patently unfair, not to mention arguably unlawful, with all the appearance of attempting to preserve the current situation and validate the actions of United Airlines and the airport police . security, who they employed as a goon squad, but I fail to see how giving airline personnel the power to deny passage, seemingly, on a whim or, worse, on the basis of personal prejudices, in any way improves flight safety.