They're just... wheels.
google has many studies and articles on the dangers of this but a link to get you started
https://www.consumerreports.org/car-safety/the-hidden-danger...
now those poor babies, children and vertically challenged adults will be safe as safe can be... yipeee
Slogan of the company is literally "There's no place for mercy!"
It'd be hilarious if it wasn't the governing principle of America.