We are at the mercy of the official who interprets the law/policy. Whether right or wrong they got a job to do. Sometimes those people in charge won't spend the time debating the legality of there actions.
Motives vary among individuals. So you might meet a guard concerned about his career who could care less what the law says and not let any wheeling device through cause the boss says so. Or you might meet his co-worker who says "f*#@% da boss".
Safety are usually the motives for banning scooters and or wheeled like vehicles.
Locations also are a factor. Location and personnel makes a difference.
Being cordial helps quite a bit sometimes, but I think TSA officers are trained in a way they avoid being swayed from there objective.
I respect authority and what they say I abide with. Usually.
I laugh at people who like to challenge authority when we all know it a losing battle, even if they're right.
Example:A popular surf break near a Military Base here on made headline news when a Christian Surf Club met opposition to there favorite surf break. Usually open ,but activity in the week restricted access.
Their rights and argument: Public Beach Access backed with Documents
Their oppostion: DOD
Who you think won.
Everywhere we go there are laws and policies. Some places guards carry walkie-talkie, and some places they carry walkie-talkie and an Armalite.
Now would you like to get shot and die, knowing it was a wrongful death. Or would you rather walk away knowing you were wronged.
Point, is there are a few who think just because they have written document that favors their interest, it doesn't mean you will be granted favor.
United Airlines is another example. They were totally wrong but only admitted after the fact, people were kicked off.
Use discretion and be humble, be safe, and be kind.