Its extraordinarily rare to the point of not even worth counting. But when it happens once somewhere in the world it gets reposted on every single clickbait news website and spread all over social media.

It's not, but that doesn't stop sensationalist articles being written…

https://nypost.com/2019/08/31/nyc-bicyclists-are-killing-ped...

It is not common. In Britain, well over 99% of pedestrian deaths are caused by motor vehicles.

https://www.theguardian.com/commentisfree/2018/mar/08/killer...