Little Red wagons generally don't travel at 20mph in the street with cars going even faster. That kid in the photo can barely hold herself upright. One little wiggle or unexpected turn and she'll slip right through those bars and under an SUV.

Seriously, you might as well just put your kid in to one of these.

it's only unsafe because of all the cars. aside from that, whats' the danger...

Swimming in a pool of razor blades is only unsafe because of all the razor blades. Aside from that, what's the danger?

...they might fall out?

Yes

there are so many people who have both no cognitive ability to imagine something they haven't personally experienced or is the norm and have never gotten anywhere any other way but a car.

it's funny to because compared to literally anything but a motorcycle cars are hella dangerous, and the deaths from all the other modes except airplanes are from getting hit by a car