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With the exposed (horizontal) propellers, how can that ever be made safe? You would have to have something surrounding that or it would be very unsafe, automatic cutoffs. Not to mention the way someone could use it to attack people by flying down into a crowd.

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The most common of transportation in the US also kills people when it is driven into a crowd.

Yes, but a running engine in a car, parked on the parking lot is seldom dangerous.

An open propeller is a safety risk, no matter how you put it.

When touching ground, something could automatically cover it. I don’t think it’s final yet.

I'm sure its not final. But I'm kind of surprised they show it in this form, cause it's crazy dangerous. And I'm not even talking about the "escape from an upside down craft in the water" training (it's like top gun's pool scene!). Of course in real life it won't be used to fly over the water in ordinary conditions.

It is the unavoidable phase of flight where it is in the air near the ground that is the problem.

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