I am not being judgy, I have gone through such gates many times. But what ELSE can be done to save people from themselves? Close them completely? As history shows, people will still leave the area. In fact, I would put down $1000 right now that says more than one person a decade would die at Berthoud if it returned to more of a "resort" type area.
I think that instead of all the signage above, taking a copy of the newspaper article and framing it could get the proper attention. Something like this on a frame (taken from Summitdaily)