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It isn't much different than an escalator. Escalators are fairly unsafe and not very accessible with children and the elderly the most common victims in terms of injury and death. Quite a few people die every year on escalator's from tripping, falling and other things.

True. Maybe the escalator industry has a bigger lobby. ;)

Accessibility is itself something can can be and is lobbied for. Compared with many smaller interests, like specific kinds of business, this lobby may even be considered powerful.

I often see them beside elevators, so accessibility is not always the problem.

That is true. But they can be out of order or simply around a corner. We are sometimes suffering from tunnel vision or overestimate our abilities and realize mistakes too late.

100 years later, security still is an issue.