I’m sure plenty of pedestrians have been killed by cyclists.
I did some quick searching and found 2019 data from Europe. In all of the EU that year, bicycles killed 19 pedestrians while cars killed 3200 pedestrians. Over 168 pedestrians killed by a car for each killed by a bicycle. I know there are plenty of irresponsible cyclists, and yet they are still a tiny fraction as dangerous as a driver.
The comic was released the day after the election, by an author who lives in the United States. I suspect the comic is explicitly about American politics.